Oscillator Leakage Calibration

An apparatus comprising:

• a mixer circuit comprising:
• a first stage comprising at least one transistor coupled between a mixer input and a mixer output;
• a second stage comprising one or more transistors coupled between the at least one transistor of the first stage and the mixer output;
• and
• means for tuning the at least one transistor of the first stage;
• and
• calibration circuitry comprising:
• at least one resistor coupled between a power distribution node and at least one mixer node, the at least one mixer node coupled between the at least one transistor of the first stage and the one or more transistors of the second stage;
• at least one switch coupled in series with the at least one resistor between the power distribution node and the at least one mixer node;
• and
• means for controlling the means for tuning based on at least one voltage associated with the at least one resistor.

A method for mixer calibration, the method comprising:

• closing a plus switch to connect at least one resistor to a plus mixer node coupled between a plus transistor of a first stage of a mixer circuit and a second stage of the mixer circuit;
• measuring a plus voltage corresponding to the plus transistor of the first stage of the mixer circuit using the at least one resistor;
• opening the plus switch to disconnect the at least one resistor from the plus mixer node;
• closing a minus switch to connect the at least one resistor to a minus mixer node coupled between a minus transistor of the first stage of the mixer circuit and the second stage of the mixer circuit;
• measuring a minus voltage corresponding to the minus transistor of the first stage of the mixer circuit using the at least one resistor;
• and
• adjusting at least one bias voltage applied to at least one of the plus transistor or the minus transistor of the first stage of the mixer circuit based on the plus voltage and the minus voltage.

An apparatus comprising:

• a communication chain comprising:
• a mixer comprising:
• a plus transistor comprising a plus channel terminal and a plus gate terminal;
• and
• a minus transistor comprising a minus channel terminal and a minus gate terminal;
• at least one resistor;
• a plus switch coupled in series with the at least one resistor between the plus channel terminal of the plus transistor and a power distribution node, a plus node coupled between the plus switch and the at least one resistor;
• a minus switch coupled in series with the at least one resistor between the minus channel terminal of the minus transistor and the power distribution node, a minus node coupled between the minus switch and the at least one resistor;
• at least one bias voltage generator coupled to the plus gate terminal of the plus transistor and the minus gate terminal of the minus transistor;
• and
• calibration circuitry coupled between the plus node and the at least one bias voltage generator and between the minus node and the at least one bias voltage generator.