| 摘要 |
Bias voltage generators that can generate variable bias voltages for transistors in mixers and other circuits are disclosed. In an exemplary design, an apparatus (e.g., a wireless device or an integrated circuit (IC)) includes at least one transistor and a bias voltage generator. The transistor(s) have a threshold voltage and receive a bias voltage. The bias voltage generator generates the bias voltage based on changes to the threshold voltage of the transistor(s), e.g., due to IC process and/or temperature. In an exemplary design, the bias voltage generator includes a replica transistor that tracks the transistor(s) and an op-amp that provides a gate voltage for the replica transistor. The bias voltage is generated based on the gate voltage. The bias voltage generator may generate the bias voltage (i) to track the threshold voltage of the transistor(s) in a first mode or (ii) based on a fixed voltage in a second mode. |
