46results about How to "High common mode rejection" patented technology

A low power, low noise amplifier system includes at least one amplifier having first and second differential input terminals, first and second differential output terminals and providing a differential output; first and second input capacitors interconnected with the first and second differential amplifier input terminals; first and second feedback circuits containing first and second feedback capacitors, respectively, interconnected with the amplifier differential input and output terminals; an input chopper switch circuit for receiving a low frequency differential input and selectively, alternately swapping those low frequency differential inputs through the input capacitors to the differential input terminals of the amplifier; an output chopper switch for receiving and selectively, alternately swapping the amplifier differential outputs synchronously with the input chopper switch circuit; and a low pass filter responsive to the swapped differential outputs for providing a low noise, low power amplification of the low frequency differential inputs.

An amplifier comprising a differential amplifier configured to be provide a comparator function, and a gain trimming circuit is electrically configured to provide gain trimming using a T-network comprising a varistor element. In addition, a method of trimming the gain of a differential amplifier, comprising the steps of a first step, (a) providing the differential amplifier comprising resistors in both of its paths, a second step, (b) providing a varistor in a T-network between both said paths; and lastly, a third step, (c) trimming the gain of the differential amplifier by adjusting the varistor's resistance.

A DSL line conditioner achieves high performance sufficient to simultaneously support video, voice and data signals on standard telephone twisted pair lines over substantially greater distances than are currently available. The line conditioner automatically adjusts and sets the upstream and downstream preamplifier gains and attenuations according to the actual degradation imposed upon the upstream and downstream signals by the twisted pair line in which the line conditioner is used. The line conditioner achieves high performance by optimizing the signal-to-noise ratio and signal quality of DSL signals, and has a low power budget that enables it to operate by deriving power from the twisted pair lines over which it is used.

Devices and methods for multilayer packages, antenna array feeds, test interface units, connectors, contactors, and large format substrates. The device comprising a 3D coaxial distribution network structure including a plurality of coaxial transmission lines separated by a first pitch at the input and a second, wider pitch at the output thereof.

The invention relates a method for detecting line insulation of a circuit board. According to the method, the insulating resistance of the circuit board is detected by adopting an insulating resistance testing circuit of the circuit board. The detection method comprises the following steps of: providing a compensating circuit which is connected with the compensating end of a front end circuit; and generating compensating voltage or current by using the compensating circuit to eliminate the error of output total voltage Uo of the front end circuit, wherein the error only refers to an error generated by the base current IB of a triode which is in a conducted state in a triode array flowing into a sampling resistor. According to the method, an amplifying circuit consists of multiple stages, and the amplifying time is adjustable and high; an error output quantity caused by the base current of the triode in the measuring circuit is compensated through the compensating circuit, and an error caused by the base current of the triode in the triode array is eliminated; and double-end differential mode input is adopted at the first stage of the amplifying circuit, and single-end output is adopted at the tail stage of the amplifying circuit, so that the amplifying circuit has the characteristics of high common-mode rejection capability, low null drift, high input impedance, low output impedance and the like.

The invention discloses a single-converted-to-double low noise amplifier with a highly balanced and stabilized differential output gain phase. The amplifier comprises a common source or common emitter input amplifying transistor pair which comprises a first transistor and a fourth transistor, a common gate or common base amplifying transistor pair which comprises a second transistor and a third transistor, a tail current source pipe and output load circuits with tight coupling differential inductors; a fourth inductor L4 and a fifth inductor L5 are tight coupling differential inductors; C1 and C2 are differential capacitors with the same capacitance values; L0 and L1 also are tight coupling differential inductors. For the amplifier disclosed by the invention, since output loads adopt the tight coupling differential inductors L4 and L5 and the differential capacitors C1 and C2 for resonance, the balance and the stability of the differential output gain phase are improved, and the high-impedance tail current source pipe M5 can well restrain a common mode signal. The amplifier disclosed by the invention has excellent robustness when the PVT (Pressure Volume Temperature) and a working frequency point are changed, and at the same time, the amplifier has an excellent anti-interference capacity for the medium base noise.

The invention discloses a multi-transmission zero-point balanced filter loaded by a coupled feeder, including symmetrical first and second differential input ports, symmetrical first and second differential output ports, and symmetrical first and second branch-loaded ring resonators ; The first and second differential input ports are respectively cascaded with first and second impedance transformation lines, the first and second differential output ports are respectively cascaded with third and fourth impedance transformation lines, and the first impedance transformation line is loaded with a first feeder line, The third impedance transformation line is loaded with the second feeder line, the ring resonator part of the first branch loaded ring resonator is coupled with the first and second feeder lines, the second impedance transformation line is loaded with the third feeder line, and the fourth impedance transformation line is loaded with The fourth feeder, the ring resonator part of the ring resonator loaded by the second branch is coupled with the third and fourth feeders, the first branch is loaded between the first and third feeders, and the second and third branches are loaded between the second and fourth feeders . The invention has the advantages of high selectivity, high common mode rejection, low differential loss and the like.