| 摘要 |
An amplifier comprises an input transistor for receiving an input signal and a current source having a first and a second terminal, coupled to the input transistor at said first terminal and being adapted to be coupled to a direct current (DC) power supply at said second terminal. An active load is coupled to said input transistor, said active load being adapted to be biased by a biasing signal such that a noise signal at said second terminal is substantially attenuated at said first terminal. In accordance with another embodiment of the invention, in an amplifier, a method for providing a constant gain over a substantially wide frequency range, comprises the steps of receiving a differential input signal by a differential input stage of the amplifier so as to generate an output current signal in response to said input signal; transforming said output current signal to an output voltage signal; and substantially attenuating noise signals generated by a direct current (DC) power supply coupled to said amplifier in a manner so as to reduce the noise signal in said output voltage signal.
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