Abstract: A linear amplifier is configured with a current-feedback amplifier followed by a voltage-feedback amplifier to drive a totem-pole output stage. The output stage includes a series arrangement of an npn transistor and a pnp transistor with their emitters coupled in series and to an output node. The voltage amplifier driving the output stage is also configured with totem-pole elements, wherein a conductive path between the voltage-feedback amplifier and an output transistor is included to reduce conduction of the output transistor when the opposing output transistor is driven to increase conduction as a result of a high-frequency input signal. A capacitor may be included between the collector and base of a transistor in the circuit path that drives an output transistor in the output stage to briefly reduce its conduction when the opposing output transistor is driven to increase conduction.

Abstract: An apparatus for affecting operation of a signal treating device that is provided an operating voltage ranging between an upper voltage limit and a lower voltage limit for treating at least one input signal includes: a respective dynamic bias unit coupled with the signal treating device for each respective input signal of the at least one input signal; and a respective transconductance control unit coupled with each the respective dynamic bias unit. Each respective dynamic bias unit and transconductance control unit cooperates to operate the signal treating device responsive to the at least one input signal approaching at least one of the upper voltage limit and the lower voltage limit.

Abstract: An apparatus for affecting operation of a signal treating device that is provided an operating voltage ranging between an upper voltage limit and a lower voltage limit for treating at least one input signal includes: a respective dynamic bias unit coupled with the signal treating device for each respective input signal of the at least one input signal; and a respective transconductance control unit coupled with each the respective dynamic bias unit. Each respective dynamic bias unit and transconductance control unit cooperates to operate the signal treating device responsive to the at least one input signal approaching at least one of the upper voltage limit and the lower voltage limit.

Abstract: A linear amplifier is configured with a current-feedback amplifier followed by a voltage-feedback amplifier to drive a totem-pole output stage. The output stage includes a series arrangement of an npn transistor and a pnp transistor with their emitters coupled in series and to an output node. The voltage amplifier driving the output stage is also configured with totem-pole elements, wherein a conductive path between the voltage-feedback amplifier and an output transistor is included to reduce conduction of the output transistor when the opposing output transistor is driven to increase conduction as a result of a high-frequency input signal. A capacitor may be included between the collector and base of a transistor in the circuit path that drives an output transistor in the output stage to briefly reduce its conduction when the opposing output transistor is driven to increase conduction.

Abstract: An apparatus for converting a fully-differential input signal to an output signal which varies between two rail limits and includes: (a) a first buffer receiving one component at a first input, presenting a first buffer output signal at a first buffer output and generating a first representative signal; (b) a second buffer receiving the other component at a second input, presenting a second buffer output signal at a second buffer output and generating a second representative signal; (c) a control unit coupled with at least one of the buffer outputs and comparing the buffer output signals with a reference signal to generate at least one control signal for reducing drift in the first and second components; and (d) an output unit coupled for combining the representative signals from the buffers to present the single output signal with rail-to-rail variance at an output locus.

Abstract: An apparatus for converting a fully-differential input signal to an output signal which varies between two rail limits and includes: (a) a first buffer receiving one component at a first input, presenting a first buffer output signal at a first buffer output and generating a first representative signal; (b) a second buffer receiving the other component at a second input, presenting a second buffer output signal at a second buffer output and generating a second representative signal; (c) a control unit coupled with at least one of the buffer outputs and comparing the buffer output signals with a reference signal to generate at least one control signal for reducing drift in the first and second components; and (d) an output unit coupled for combining the representative signals from the buffers to present the single output signal with rail-to-rail variance at an output locus.

Abstract: Disclosed is a common-mode current feedback circuit 32 and associated systems 39 and methods 49. The circuit 32 has a differential pair of bipolar transistors Q29, Q30 to accept input from the amplifier output voltage nodes Vout−, Vout+. The differential pair of transistors Q29, Q30 are coupled to a current comparator 32. The current comparator 34 is adapted to provide stabilizing current Ictrl in response to detection of a differential in amplifier output voltages Vout−, Vout+.