Fixed-oscillation amplitude high-drive capability local oscillation waveform buffer
A technology of fixed swing and buffer, applied in the direction of differential amplifier, DC coupled DC amplifier, etc., to achieve the effect of strong driving ability
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[0031] The present invention will be further explained below in conjunction with the accompanying drawings.
[0032] A fixed-swing high-drive local oscillator waveform buffer, the entire buffer includes a differential pre-amplifier using a resistive load and a self-biased CMOS buffer structure; a bias circuit of the self-biased CMOS buffer structure is controlled by a tail current source.
[0033] The differential amplifier is used to provide the pre-amplification function; the self-biased CMOS buffer structure is based on the traditional CMOS buffer structure. A self-biased circuit is designed to bias the NMOS and PMOS transistors at the upper and lower boundaries of the output swing, respectively. The drive capability of this buffer with limited input swing is enhanced. And because of the self-biasing method, the bias circuit is omitted. The entire buffer is controlled by a tail current source to control the bias current, and a filter capacitor is connected in parallel betw...
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