Abstract: A fully differential amplifier with a high common mode rejection ratio with an independent output voltage setting is disclosed. The amplifier may be arranged with a single ended output or a differential output. The gain may be set by adjusting a resistor without affecting bandwidth of the circuit. The circuit exhibits high speed and may be implemented with various electronic component types. The DC voltage of the output, single ended or differential, may be adjusted by adjusting a reference voltage, wherein the output voltage adjustment does not substantially affect the performance of the differential amplifier.

Abstract: A buffer circuit includes an input terminal operable to receive an input signal and an output terminal at which an output signal for the buffer circuit is provided. In the buffer circuit, three transistors at most provide signal currents. Two of the three transistors can be matched. Means are provided for feeding back the output signal so that the two matched transistors are balanced in response to a change in the input signal appearing at the input terminal.

Abstract: An output circuit is described, which includes a gain stage, n and p drives, coupled to the gain stage, a mean current generator, coupled to the drives, a reference current generator, coupled to the mean current generator, and feedback circuitry, coupled between the gain stage and the mean current generator. In this circuitry the feedback, provided by the feedback circuitry to the mean current generator, is a current mode feedback. The mean current generator generates the harmonic mean of currents, provided through current nodes. The described output circuit can be operated by providing currents at the current nodes of the mean current generator, generating a mean of provided currents with the mean current generator, and providing a current mode feedback by the feedback circuitry to the mean current generator. The feedback circuitry computes the difference between the generated mean current and a reference current.

Abstract: An output circuit is described, which includes a gain stage, n and p drives, coupled to the gain stage, a mean current generator, coupled to the drives, a reference current generator, coupled to the mean current generator, and feedback circuitry, coupled between the gain stage and the mean current generator. In this circuitry the feedback, provided by the feedback circuitry to the mean current generator, is a current mode feedback. The mean current generator generates the harmonic mean of currents, provided through current nodes. The described output circuit can be operated by providing currents at the current nodes of the mean current generator, generating a mean of provided currents with the mean current generator, and providing a current mode feedback by the feedback circuitry to the mean current generator. The feedback circuitry computes the difference between the generated mean current and a reference current.

Abstract: An apparatus for current mirroring is provided. In one embodiment, the apparatus includes an input node into which an input current can flow. A transistor, through which an output current can flow, servos the input current. The transistor has an emitter, a base, and a collector. A resistor is coupled to the emitter of the first transistor. The output current can flow through the resistor. A feedback circuit has a control terminal coupled to the emitter of the first transistor and the resistor. A voltage across the resistor acts as a control voltage for the feedback circuit. The feedback circuit provides a correction current to the input node, thereby reducing the error between the output current and the input current.