Reference generation circuit for maintaining temperature-tracked linearity in amplifier with adjustable high-frequency gain

An apparatus comprising:

• a receiver equalizer peaking circuit having a capacitor Field Effect Transistor (CFET) providing a capacitive value and a resistor FET (RFET) providing a resistive value;
• a controller circuit comprising a capacitor controller digital-to-analog converter (DAC) configured to provide a CFET control voltage to the CFET based on a first reference voltage, and a resistor controller DAC configured to provide a RFET control voltage to a gate of the RFET based on a second reference voltage;
• a reference generation circuit configured to generate the first and second reference voltages, the reference generation circuit comprising:
• a replica input FET configured to generate the first reference voltage that varies at least according to a threshold voltage (Vt) of an input FET, the replica input FET configured to provide the first reference voltage to the capacitor controller DAC to maintain temperature-tracked DAC linearity;
• a replica RFET configured to generate the second reference voltage that varies with respect to (i) the first reference voltage and (ii) a Vt of the RFET, and to provide the second reference voltage to the resistor controller to maintain the temperature-tracked DAC linearity.