Abstract: Methods and devices for eliminating a systematic imbalance and reducing variations in circuit parameters for a high gain amplifies. A bias generator having a copy of an actual amplifier branch and an already generated bias voltage can be added to the amplifier to generate a bias voltage for a final current source at a current summing node so as to eliminate systematic imbalance in the bias current. A high impedance node can be wired in the bias generator such that all devices in the bias generator are in saturation across, for example, PVT (Process, Voltage and Temperature) corners in order to minimize tracking errors. A degeneration transistor similar to a differential pair element can be split into two equal halves.

Abstract: A termination impedance apparatus includes a variable pull-up resistor, a variable pull-down resistor, and a small-signal calibration circuit. The variable pull-up resistor is coupled between a first power supply voltage terminal and an output terminal. The variable pull-down resistor is coupled between the output terminal and a second power supply voltage terminal. The small-signal calibration circuit is for calibrating the variable pull-up resistor and the variable pull-down resistor to achieve a desired small-signal impedance.

Abstract: A termination impedance apparatus includes a variable pull-up resistor, a variable pull-down resistor, and a small-signal calibration circuit. The variable pull-up resistor is coupled between a first power supply voltage terminal and an output terminal. The variable pull-down resistor is coupled between the output terminal and a second power supply voltage terminal. The small-signal calibration circuit is for calibrating the variable pull-up resistor and the variable pull-down resistor to achieve a desired small-signal impedance.