68 results about "Balanced amplifier" patented technology

To eliminate an amplitude difference between luminance signals from pixels included in horizontal lines of color filters, caused by a sensitivity difference from one photosensor to another in a CCD, and reduce a horizontal stripe-like noise appearing in a monitoring image and captured image, there is provided an arithmetic circuit to calculate an amplitude difference in Gr and Gb signals based on an output from a four-channel detector to set gains multiplied by compensation factors, respectively, with which the white balance-processed Gr and Gb signals are equal in amplitude to each other, thereby controlling the gain of a while balance amplifier.

A RF power amplifying device is constituted by a system of a balanced amplifier including first phase shifters, a first RF power amplifier, a second RF power amplifier, second phase shifters, and a power combiner. Transmitting power Pout is detected by a first power level detector connected to an output of the first RF power amplifier, a second power level detector connected to an output of the second RF power amplifier, and an adder. A level control signal from a level control circuit controls transmitting power in response to a transmitting signal with wanted power level and a detected signal of the adder.

An automatic tuning procedure can be used to allow a small, high efficiency ferrite antenna assembly to be used in various FM frequency based devices. The ferrite antenna can take the form of a rod or flat disk, for example, which can use a pick-up coil and tuning coil to provide sufficient signal strength using a small FM antenna. A balanced amplifier can be used to provide differential input in order to further reduce noise. A microcontroller can determine the strength of the FM signal at various frequencies and can automatically tune the operating frequency to optimize system performance.

The color signal processing circuit includes a first calculation unit generating an R / G value, a second calculation unit generating a B / G value, and a position specifying unit specifying, based on the R / G and B / G values, a position expressed as a color temperature of the light of a light source in a color coordinate system defined by R / G and B / G coordinate axes as the position of the light source. The color signal processing circuit further includes a pull determining unit determining a displacement amount between the light source position specified and a position of a target point on a blackbody radiation curve defined in the color coordinate system, sets gain values for the R, G, B color signals for achieving a white balance based on the displacement amount, and supplies the gain values to white balance amps amplifying the R, G, B color signals, and carries out white balance processing.

The invention discloses a strong anti-mismatch high-efficiency power amplifier based on a transistor stacking technology. The power amplifier comprises a -45-degree phase-shifting input matching network, a +45-degree phase-shifting input matching network, a double-path balance type three-stack power amplification network, a +45-degree phase-shifting output matching network, a -45-degree phase-shifting output matching network, a first power supply bias network and a second power supply bias network. According to the power amplifier, a three-stack transistor amplification network is adopted to realize an amplification function of the balance type amplifier, so that the power gain and the power capacity of the balance type power amplifier are improved, and meanwhile, a three-stage T-shaped filtering type phase-shifting circuit is used for realizing the + / -45-degree phase-shifting control of two paths of balance signals and input and output impedance matching, so that the anti-mismatch characteristic of the amplifier is greatly improved on the premise of ensuring low insertion loss and high efficiency, and thus the stability and the reliability of the circuit are improved. A strong anti-mismatch high-efficiency power amplifier chip circuit realized by the invention is high in output power, high in power gain and small in area.

A switchable balanced amplifier having multiple, configurable independent input / output paths. Switching networks coupled to the input and / or output quadrature couplers of the balanced amplifier are used to configurably direct any of one or more input signals to any of one or more output ports. In one example, each output port is coupled to circuitry tailored to a specific type of input signal, operating protocol and / or operating frequency band.

The invention provides a method and a bridge for improving inductance measurement precision of a Maxwell bridge, and belongs to the field of measurement testing. According to the method, an inductive voltage divider is combined with a fixed standard capacitor and a standard resistor, and a method for adjusting the output voltage of the inductive voltage divider is used for adjusting the equivalent capacitance and resistance. Simultaneously, the invention has a function of automatic auxiliary balance; the precision measurement for inductance value can be realized by simply completing the balance of the bridge; and the convergence rate of the bridge is greatly improved. Aiming at a shock absorption branch which is required to be introduced for the adding of the automatic auxiliary balance amplifier, the invention provides a compensation circuit for compensating the error caused by the shock absorption branch. In order to overcome the influence of the output impedance of the inductive voltage divider, the invention provides a double-pole high-precision voltage follower with a buffer output stage. By the invention, the speed for measuring inductance is increased, the measurement precision is improved, the service life of the bridge is prolonged, and the reliability of the bridge is improved.

A balanced amplifier is disclosed as comprising an input stage connected with a second stage, in which the input stage outputs signals to the second stage, and the first stage includes a first differential amplifier for receiving balanced input signals and is provided with two pairs of feedback loops, at least one of the pair of feedback loops for feedbacking part of signals outputted by the second stage to the first differential amplifier, and the second stage includes a second differential amplifier for amplifying signals received from the first stage and for maintaining the balanced signals.

The invention discloses an improved type cross-coupling sensitive amplifier. The improved type cross-coupling sensitive amplifier comprises a voltage pre-charging balance circuit, a PMOS (P-channel Metal Oxide Semiconductor) cross-coupling amplifying circuit, an NMOS (N-channel Metal Oxide Semiconductor) cross-coupling amplifying circuit and an output circuit, wherein the voltage pre-charging balance circuit is connected with the PMOS cross-coupling amplifying circuit and the NMOS cross-coupling amplifying circuit; and the NMOS cross-coupling amplifying circuit is connected with the PMOS cross-coupling amplifying circuit and the output circuit. The voltage pre-charging balance circuit is used for pre-charging and balancing signals of an output port of the amplifier and cutting off an output path of the amplifier; the PMOS cross-coupling amplifying circuit is used for acquiring and quickly amplifying a voltage difference on a bit line; the NMOS cross-coupling amplifying circuit is used for secondarily amplifying the voltage difference on the bit line; and the output circuit is used for converting differential signals output by the amplifying circuit into single-end signals and simultaneously improving the rear-stage driving capability.

An amplifier gain setting section estimates a light source parameter which relies upon a spectral distribution of an image pickup light source based on an image signal. Then, a first adjustment control value for each color signal when adjustment is to be performed so as to establish a white balance based on the estimated parameter is modulated by an amount corresponding to a follow-up sensitivity toward a second adjustment control value when adjustment is to be performed so that an achromatic subject under a particular reference light source is reproduced as an achromatic subject. The modulated adjustment control value is set to a white balance amplifier. The follow-up sensitivity is set to the amplifier gain setting section in response to an illuminance level estimated from a detection value of the brightness.

A receiver circuit, comprises an input balun circuit comprising a balanced balun output and being capable of receiving RF signals, an input amplification circuit comprising a balanced amplifier input and a balanced amplifier output, a single balanced in-phase mixing circuit comprising a first unbalanced RF mixer input and a balanced in-phase mixing frequency input, and a single balanced quadrature mixing circuit comprising a second unbalanced RF mixer input and a balanced quadrature mixing frequency input. The balanced amplifier input is connected to the balanced balun output, a first terminal of the balanced amplifier output is connected to provide an amplified RF signal to the first unbalanced RF mixer input and a second terminal of the balanced amplifier output is connected to provide a phase-shifted amplified RF signal to the second unbalanced RF mixer input.

The invention discloses a micro structure MiMo radio frequency front end assembly. The micro structure MiMo radio frequency front end assembly comprises even groups of radio frequency front end transceiver assemblies including a micro transceiver antenna, a polarization transformer, a first channel filter, a second channel filter, an AGC (automatic gain control) receiving module and an ALC (adaptive logic circuit) emitting module, wherein the micro transceiver antenna is connected with an input end of the AGC receiving module through the polarization converter, the first channel filter and the AGC receiving module in sequence; an output end of the ALC emitting module is connected with the micro transceiver antenna through the second channel filter and the polarization transformer in sequence; the AGC receiving module comprises a first balance amplifier, a first electrically controlled attenuator, a second balance amplifier, a first coupler and a first direct-current processing circuit; the ALC emitting module comprises a second electrically controlled attenuator, a third balance amplifier, a fourth balance amplifier, a second coupler and a second direct-current processing circuit. The micro structure MiMo radio frequency front end assembly is high in integration degree and capable of greatly reducing the size of the MiMo radio frequency front end assembly, and has the advantages of being high in linearity, high in gain and the like.

A balanced amplifier (1) is provided with: a first operational amplifier (11) whose reverse-phase input terminal is connected to an input voltage source (30) and whose reverse-phase input terminal is connected to an output terminal of the first operational amplifier; a second operational amplifier (12) whose positive-phase input terminal is connected to the input voltage source and whose reverse-phase input terminal is connected to an output terminal of the second operational amplifier; and a voltage division circuit (20i, 20j, 20k, 20l) for dividing a reference voltage supplied from a reference voltage source (40), the reference voltage source being connected to a positive-phase input terminal of each of the first operational amplifier and the operational amplifier through the voltage division circuit.

The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E / F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.

A balanced amplifier comprising a pair of voltage-to-current converters including a first input terminal, a second input terminal, a first output terminal and a second output terminal to convert an input voltage applied to the first input terminal into an output current output from each of the first output terminal and the second output terminal, the second input terminal and the second output terminal of one of the converters being connected to the second input terminal and the second output terminal of the other of the converters to cancel common-mode components each other and extract differential-mode components.

According to an exemplary embodiment, a balanced amplifier includes an in-phase amplifier coupled to a first input port of an output coupler and a quadrature amplifier coupled to a second input port of the output coupler. The balanced amplifier further includes an impedance termination coupled to an isolated port of the output coupler. The balanced amplifier further includes a protection circuit coupled to the isolated port of the output coupler and configured to limit an amount of power applied across the impedance termination. The balanced amplifier further includes an input coupler having a first output port coupled to an input of the in-phase amplifier and a second output port coupled to an input of the quadrature amplifier.

An amplifier redundancy system includes an amplifier receiving signals from a first input switch when the switch is in a side port position. The system further includes a first output switch, in a side port position, receiving signals from the amplifier. A second amplifier receives signals from the first input switch through a second input switch and generates amplified signals therefrom. The second input switch also receives signals from the first input switch when the first input switch is in the side port position. The first input switch is initially in the side port position but switches to a through port position in response to a failure in the second amplifier. A second output switch is in a through port position and switches to a side port position and receives signals through the first output switch in response to the failure in the second amplifier.

The present invention provides a technology capable of achieving an improvement in the characteristic of a power amplifier when a power amplifier mounted onto mobile communication equipment such as a cellular phone is comprised of the balance amplifier. One feature of an embodiment resides in that each of passive parts disposed in a low-band signal negative path and each of passive parts disposed in a low-band signal positive path are placed in positions where they are symmetric with respect to a center line of a semiconductor chip. Thus, the symmetry between the low-band signal negative path and the low-band signal positive path is enhanced. As a result, a loss in matching due to the difference between the low-band signal negative path and the low-band signal positive path can be enough reduced, and the characteristic of a low-band signal balance amplifier can be enhanced.

The invention discloses a micro-wave low-band ultra-micro power combiner, which is characterized in that a circuit composition comprises power dividers with a tree structure, more than or equal to 2 of multi-channel balanced amplifiers, and combiners with a tree structure, wherein each balanced amplifier consists of an IC amplifying device and two 3dB quadrature bridges, the power dividers, the combiners, the 3dB quadrature bridges in the balanced amplifiers, and peripheral circuits of the IC amplifying devices in the balanced amplifiers are produced on a ceramic substrate, and the IC amplifying devices are fixed on the ceramic substrate through wedge bonding. Circuits of a radiofrequency power combiner are produced on the ceramic substrate, the IC amplifying devices are fixed on the ceramic substrate through wedge bonding, the circuits have good consistency and the power combiner has the advantages of high gain, high integration level, high efficiency, small volume and so on, and the power combiner, is suitable for mass production, greatly reduces production cost, and is suitable to be applied to base station transmitters and small whole machines in the field of microwave communication.

A balanced amplifier includes a bypass branch (19), termination elements (TE1, TE2) and an amplifying section (10). The section (10) includes amplifiers (A1, A2), first coupling / splitting unit (14) having a first input signal receiving port (14a), a second port (14b) connected to a termination element (TE1), a third port (14c) connected to a first amplifier (A1), and a fourth port (14d) connected to a second amplifier (A2). The section (10) also includes second coupling / splitting unit (16) having a first port (16a) connected to first amplifier (A1), a second port (16b) connected to second amplifier (A2) and a third port (16c) connected to a termination element (TE2). The second coupling / splitting unit (16) combines signals from amplifiers (A1, A2) as output signals on a fourth port (16d) for supply to a signal output (O). The branch (18) is connected to the second port (14b) of the first coupling / splitting unit (14) and provides bypass signals to output (O).

The invention discloses a micro transceiver assembly. The micro transceiver assembly comprises an AGC (automatic gain control) receiving module and an ALC (adaptive logic circuit) emitting module, wherein the AGC receiving module comprises a first balance amplifier, a first micro belt filter, a first electrically controlled attenuator, a second balance amplifier, a first coupler and a first direct-current processing circuit; the ALG emitting module comprises a second electrically controlled attenuator, a third balance amplifier, a second micro belt filter, a fourth balance amplifier, a second coupler and a second direct-current processing circuit; the first balance amplifier, the second balance amplifier, the third balance amplifier, the fourth balance amplifier, the first micro belt filter, the second micro belt filter, the first electrically controlled attenuator, the second electrically controlled attenuator, the first coupler and the second coupler are manufactured on a ceramic base plate through a superfine micro belt film process. The micro transceiver assembly is integrated on a circuit in the form of a distribution parameter, so that peripheral assemblies are reduced, the integration degree of the whole transceiver assembly is relatively high and the size of the transceiver is greatly reduced.

A balanced amplifier with a relatively high input impedance with wide bandwidth for use as a fly-height sensor head preamplifier in a magnetic storage read system. The balanced amplifier has two substantially identical halves, each amplifier half having an input transistor, responsive to the input node of the amplifier half disposed in series with a cross-coupling transistor receiving a buffered cross-coupled version of the input signal applied to the other half of the balanced amplifier. Use of cascoded transistors and voltage-followers to limit voltages across various the input and cross-coupling transistors enhance the common mode rejection and power supply rejection ratios of the amplifier while retaining a low high-frequency noise figure similar to low-input impedance balanced amplifier designs.

The invention provides a microwave low waveband ultra-micro automatic gain control heterodyne receiving module. A circuit is formed in the mode that radio frequency signal inputs a balanced amplifier, a matching type electrically controlled attenuator, a microstrip bandpass filter, a balanced amplifier and a singly-balanced mixer which are orderly connected, and the single-balanced mixer outputs intermediate frequency signal. The module has the advantages of small volume, good circuit consistency, compact structure of the whole circuit and high integration level, and the module is only one-tenth of the prior product in size, thereby facilitating the micromation of the whole receiver; due to the adoption of the matching type circuits such as the balanced circuit, the circuit has stable performance; due to the adoption of the matching type electrically controlled attenuator, the circuit has good standing wave property; and because the attenuation of the electrically controlled attenuator is controlled by an intermediate frequency output level of the mixer, the automatic gain control of the heterodyne receiver is realized.