| 摘要 |
A mixer system includes a multi-phase signal generator, a mixer, and a mixer control circuit. The multi-phase signal generator generates a plurality of mixer input signals, where each has a frequency equal to the others, and a phase, and where the phases are distributed between 0 to 360 degrees. The mixer control circuit generates a plurality of mixer control voltages which are controlled by digital state control input signals. Each mixer control voltage controls the influence of a corresponding mixer input signal on the mixer output signal. In a preferred embodiment, the mixer control voltage is generated by storing a charge on a capacitor, and said charge is increased or decreased through the combined action of the digital state control input signals and the mixer control voltages by means of interconnected mixer control subcircuits. When combined with a data phase detector, the mixer system can be and used within a clock and data recovery system to generate a clock which is phase- and frequency-locked to a serial data stream.
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