| 摘要 |
Bias circuits, amplifiers and methods are provided, such as those for providing bias signals over a range of common mode inputs for an amplifier to output a constant current. One example of a bias circuit is configured to generate a bias signal having a voltage magnitude according to a reference signal. The reference signal is indicative of a common mode input level of an input signal of the amplifier circuit and the bias circuit is further configured to adjust the bias signal over a range of common mode input levels. An amplifier receiving the bias signal is configured to generate an output signal in response to an input signal and drive an output current based on the voltage magnitude of the bias signal provided by the bias circuit.
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