| 摘要 |
A mixer of a communication system. The communication system has an antenna, low noise amplifier, a mixer, a local oscillator and an intermediate frequency filter. The mixer has a mixer circuit, a gain amplified circuit, a voltage auto-tracking circuit and a direct current voltage generating circuit. The direct current voltage generating circuit can reduce the output power of the local oscillator, extend the lifetime of the battery used in the mobile communication system, and reduce the distortion of harmonic wave of the local oscillator to reduce the noise figure of the mixer. Using the voltage auto tracking circuit and the gain amplified circuit, the linearity of the mixer is enhanced, and the conversion gain of the mixer is adjusted by varying the load resistors.
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