56results about "Amplifiers with diodes" patented technology

An amplifying transistor for amplifying a radio frequency signal between an input terminal and an output terminal. The cathode of a first diode is connected to the input terminal and the anode of a second diode is connected to the output terminal. A matching and attenuating circuit is connected between the anode of the first diode and the cathode of the second diode. A matching and attenuating circuit reduces impedance mismatches on the input terminal side and the output terminal side, and attenuates the radio frequency signal. In an amplification mode, a bias circuit supplies a bias current to an amplifying transistor and a current mirror circuit turns off the first and second diodes. In an attenuation mode, the bias circuit supplies no bias current to the amplifying transistor and the current mirror circuit turns on the first and second diodes.

A light source is gated ON and OFF in response to a pulsed signal. Photo emissions from the light source are coupled to a material under test. Resonant fluorescent emissions from the material are coupled to a photodiode. Current from the photodiode is coupled into an amplifier system comprising a first and second amplifier stages. The first amplifier stage is gated to a low gain when the light source is turned ON and the gain is increased when the light source goes from ON to OFF. The second amplifier stage has digitally programmable offset and gain settings in response to control signals. The output of the second amplifier stage is digitized by an analog to digital converter. A controller generates the pulse control signal and the control signals.

The invention discloses a device for improving the signal to noise ratio of an inductosyn signal, and relates to the field of inductosyn angle measurement. The device comprises a pre-amplification circuit, the pre-amplification circuit comprises a signal input terminal IN1, a signal input terminal IN2, a high-precision matching tube U1, a triode Q and a diode D, the signal input terminal IN1 and the signal input terminal IN2 are connected with an output winding of an inductosyn, the resistors R3 and R4 are connected with a potentiometer RP1 in series to form a zero adjustment circuit, and thetriode Q, the diode D, a resistor R5, a resistor R6 and a resistor R7 form a constant current source circuit. A pre-amplifier adopts the high-precision matching tube to carry out amplification processing, the background noise of the inductosyn and the electromagnetic interference generated by motor PWM can be effectively filtered by utilizing the characteristic of high matching parameters of the high-precision matching tube, and a zero voltage can be adjusted by an adjusting potentiometer RP1 in the pre-amplification circuit, so that the influence of zero error is eliminated.

Apparatus and methods for an integrated circuit, single ended-to-differential amplifier are provided. In an example, the amplifier can include an amplifier circuit having a first input configured to receive a single-ended signal, a second input, and a differential output configured to provide an amplified representation of the single-ended signal. The amplifier can include a filter circuit configured to balance a common-mode voltage between the first and second inputs of the amplifier circuit. The filter circuit can include a common-mode input configured to receive the common-mode voltage, a first impedance network coupled between the common-mode input and the first input of the amplifier circuit, and a second impedance network coupled between the common-mode input and the second input of the amplifier circuit. The filter circuit can provide a low frequency pole below 1 hertz.

The invention includes a power amplifier with an amplifier core including parallel amplifier cells, a replica cell made of one amplifier cell similar to those of the amplifier core, a power controller to select a combination of amplifier cells to activate, a regulator to fix the top voltage of the replica cell to a reference voltage, a voltage generator to provide the voltage reference to the regulator, a current generator to provide a reference current through the replica cell, and a drive unit controlled by the regulator output to drive the combination of amplifier cells, so that each selected combination of activated cells defines a predetermined attenuation level of power amplifier output signal so that it is attenuated in a stepwise manner.

The invention provides a transimpedance amplifier chip and a light receiving module. The transimpedance amplifier chip comprises a photoelectric detector, a filter capacitor and a transimpedance amplifier chip which are packaged in the same packaging body, wherein the trans-impedance amplifier chip comprises a built-in filter resistor region and a trans-impedance amplifier device region which areisolated through a deep trench, a filter resistor is formed in the built-in filter resistor region, two ends of the filter resistor are led out to corresponding bonding pads through metal layer leads,and the built-in filter resistor and each metal layer in the built-in filter resistor region are not connected with a substrate; and devices forming a transimpedance amplifier are formed in the transimpedance amplifier device region. According to the invention, the filter circuit formed by the filter capacitor and the filter resistor is added to reduce the influence of an external Wi-Fi signal onan optical receiver and improve the sensitivity of the optical receiver; the filter resistor is arranged in the trans-impedance amplifier chip, so that the use cost of the off-chip resistor is saved,the space limitation of packaging and routing is eliminated, the packaging and routing scheme is simplified, and the practical value is high.

Apparatus and methods for an integrated circuit, high-impedance network are provided. In an example, the network can include an anti-parallel diode pair coupled between first and second nodes. The anti-parallel diode pair can include a first diode including a P+ / NWELL junction and a second diode including N+ / PWELL junction. In an example, the first diode and the second diode can include a common substrate.

In conventional high data rate receivers, the transmitted optical signal has poor extinction ratio and translates into a small modulated current with a large DC current, which saturates the receiver TIA and amplifiers, and significantly degrades the gain and bandwidth performance. Consequently, cancelling PD DC current in high data rate receivers is desired for proper operation. Differential TIA schemes, i.e. providing separate AC-coupled and DC-coupled paths, in parallel, provide better linearity for large input currents and low gain settings. To AC couple the PD to the TIA using passive AC-coupling circuitry, an AC-coupling capacitor (CC) is positioned between the PD and the TIA to block the DC current, while passing the modulated AC current to the TIA. A DC cancellation circuit may be provided, without a capacitor, to maintain the receiver input bias while suppressing any DC component generated by the PD for the DC-coupled path.

An amplification circuit (5), a laser measurement device comprising the amplification circuit (5), and a mobile platform. The amplification circuit (5) comprises an operational amplification module (21) and an adjustment module (22). The adjustment module (22) is located on at least one of a pre-stage circuit, a post-stage circuit or a feedback circuit of the operational amplification module (21),and is used for adjusting the amplification of an input signal of the amplifier (5), so that the amplification circuit (5) enlarges energy of the input signal by using the adjusted amplification, andthen outputs the signal. By means of the amplification circuit (5), the amplification of the amplification circuit (5) can be dynamically adjusted according to the energy of an input signal, so as toavoid the saturation of an operational amplifier.

The invention discloses a high-dynamic-range trans-impedance amplifier with three controlled current branches. The high-dynamic-range trans-impedance amplifier comprises an operational amplifier and the three controlled current branches. Wherein the first controllable current branch is arranged between the input end of the operational amplifier and an external input power supply, the second controllable current branch is arranged in the operational amplifier, and the third controllable current branch is arranged between the output end and the input end of the operational amplifier; the dynamicrange of the trans-impedance amplifier is widened through the combined action of the three controllable current branches, and a direct-current working point is stabilized. Due to the fact that an extra current branch is introduced outside the feedback loop, gain adjustment almost has no influence on zero-pole stability, and the dynamic range is enlarged. Meanwhile, the three controlled current branches are dynamically adjusted along with the input current intensity, and it is guaranteed that stable working points exist in the whole dynamic range.

Provided is a reference voltage circuit including a Zener diode having a cathode connected to a current source via a first node, and an anode connected to a ground point; a first resistor having one end connected to the first node; a second resistor having one end connected to another end of the first resistor; a first diode having an anode connected to another end of the second resistor via a second node, and a cathode connected to the ground point; and a current control circuit configured to generate a control current corresponding to an anode voltage of the first diode so that the current source supplies a reference current corresponding to the control current to the first diode.

A divider-less phase locked loop (PLL) includes a phase frequency detector (PFD), a charge pump (CP), a voltage controlled oscillator (VCO), a delay unit, and a clock gating unit. The PFD is electrically connected to the VCO through the CP, and the CP outputs a voltage control signal to the VCO. The VCO generates an output signal. The delay unit receives and delays a reference signal to generate a delay signal. The clock gating unit samples the output signal according to the delay signal. Since the clock gating unit samples the output signal according to the delay signal, the divider-less PLL does not need to include a divider to divide a frequency of the output signal. Therefore, power consumption of the divider-less PLL can be reduced.

The invention provides a pre-amplifier circuit for a photoelectric detector, comprising a high voltage generation circuit and a pre-amplifier, wherein a negative high voltage generation circuit supplies high voltage to the pre-amplifier, thereby driving an avalanche photodiode to work. An MOS transistor drive chip generates a switching signal based on an access 10KHZ square wave, thereby controlling on-off of a switch MOS transistor chip; a first inductor is charged by a power supply voltage at the moment when the switch MOS transistor chip is switched on; the power is stored in a third capacitor, a forth capacitor and a fifth capacitor through a first diode circuit; after the switch MOS transistor chip is switched off, a first diode is reversely cut off, so an output capacitor discharges power to a load; and a third resistor, a fourth resistor, the third capacitor and the fourth capacitor form a second-order RC filter circuit. The pre-amplifier is small in size and stable in performance.

The present disclosure provides a low noise amplifier with improved absolute maximum rating performance. The low noise amplifier with improved absolute maximum rating performance includes at least one transistor utilized to amplify a input signal externally inputted through an input line of the low noise amplifier; a bias unit connected to the input line and configured to set a driving condition of the transistor; impedance matching unit configured to match an impedance of the low noise amplifier; a blocking capacitor connected to the input line and configured to block a direct current of the input signal; and a first diode unit connected to a first end of the transistor and a second end of the transistor. The first diode unit is configured to adjust a voltage between the first end of the transistor and the second end of the transistor under a first standard voltage.

A light receiving front-end circuit with feedback has three N-type MOSFETs (MN0, MN1, MN2) connected in series as a load of a photodiode D1. And a P-type MOS transistor MP0 and an N-type MOS transistor MN3 together form a reverse amplifier, the input of which is the cathode of the photodiode D1, and the output of which is connected to the gate terminal of the photodiode MN0, constituting a negative feedback circuit. The invention adopts a scheme of integrating a photosensitive device and a signal conversion and amplification on an active pixel sensor (APS), and realizes the triple functions ofreceiving an optical signal, converting the optical signal into an electric signal and amplifying the optical signal through a relatively simple circuit. The light sensing circuit of the invention isrealized by a photodiode, and the amplifier is realized by a high gain circuit with feedback. These circuits have the advantages of small area, low power dissipation and easy implementation in standard CMOS process.

The invention provides a transimpedance amplifier chip and a light receiving module, comprising: a photodetector packaged in the same package body, a filter capacitor and a transimpedance amplifier chip; the transimpedance amplifier chip includes a built-in filter resistance area isolated by a deep groove And the transimpedance amplifier device area, filter resistors are formed in the built-in filter resistor area, the two ends of the filter resistors are led to the corresponding pads through the metal layer wires, the built-in filter resistors and the metal layers in the built-in filter resistor area are not connected to the substrate ; Devices constituting the transimpedance amplifier are formed in the region of the transimpedance amplifier device. The invention increases the filter circuit formed by the filter capacitor and the filter resistor to reduce the influence of the external Wi-Fi signal on the optical receiver, and improves the sensitivity of the optical receiver; overcomes technical difficulties and sets the filter resistor in the transimpedance amplifier chip, saving chips The use cost of external resistors eliminates the limitation of packaging and wiring space, and at the same time simplifies the packaging and wiring scheme, which is of great practical value.

The present invention reveals a new biasing method which can be used in solid state audio power amplifier design despite of the Class of operation. The proposed biasing technology relies only on traditional electrical feedback to build up and maintain the desired biasing current and doesn't need thermal coupling or thermal tracking techniques in order to overcome power transistor device's temperature dependent input-output characteristics as required by traditional approach. An ingenious current sensing and amplification circuit is devised in order to generate an voltage output which is only corresponding to the quiescent biasing current of the output stage. This voltage output is then used as an representative of the power stage biasing current to be regulated by a feedback loop comprising a traditional voltage multiplier, the output stage and the aforementioned current sensing and amplification circuit.

Provided is a light receiving circuit including: a photodiode; a first amplifier including a feedback resistor connected between an input and an output of an inverting amplifier and having an input connected to a cathode of the photodiode; a second amplifier having a configuration similar to that of the first amplifier and having an input connected to an anode of the photodiode; a capacitor element connected between an output of the first amplifier and the input of the second amplifier; and a bias current control circuit that outputs a bias current to the input of the second amplifier according to a current value of the photocurrent, and controls an output voltage signal of the light receiving circuit according to an output of the second amplifier by using the bias current to adjust the sensitivity. The bias current control circuit changes the sensitivity according to the output of the second amplifier.

The invention discloses an FM backscatter amplifier and a backscatter system, and the FM backscatter amplifier comprises a data receiving and transmitting module which is used for receiving an FM signal; the frequency selection module is connected with the data receiving and transmitting module and is used for carrying out frequency selection on the FM signal to obtain an FM signal with a certainfrequency band; the amplification module is connected with the frequency selection module and is used for amplifying the FM signal of the certain frequency band to obtain an amplified FM signal; and the modulation module is connected with the amplification module and is used for modulating the amplified FM signal and controlling the amplification module to reflect the amplified FM signal. According to the FM backscatter amplifier provided by the invention, the FM signal is amplified by utilizing the characteristics of the tunnel diode, and the reflected signal is increased under the conditionof ensuring very low power consumption, so that the purpose of prolonging the communication distance is achieved.

The invention provides an amplifier for LCD, comprising: an operational amplification module and an amplitude-limiting module serially connected to the operational amplification module; the operational amplification module comprising: an operational amplifier, a first resistor, a second resistor, a capacitor, a sampling voltage input terminal, a first reference voltage input terminal and a compensation voltage output terminal; the amplitude-limiting module being connected serially between the capacitor and the second resistor, the amplitude-limiting module comprising a first Schottky diode and a second Schottky diode connected in parallel, and a second reference voltage input terminal connected between the first Schottky diode and the second Schottky diode; an anode of the first Schottky diode and a cathode of the second Schottky diode being both connected between the capacitor and the second resistor. The amplifier for LCD of the invention is stable and reliable.