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Circuit for phase comparison

阅读：621发布：2023-07-09

专利汇可以提供Circuit for phase comparison专利检索，专利查询，专利分析的服务。并且An apparatus and method for phase comparison wherein a local oscillator generates a delta voltage containing a D.C. component. The delta voltage is compared with a threshold voltage derived from the delta voltage, resulting in a control signal the polarity of which depends on the outcome of the comparison. This control signal sets the frequency of the local oscillator.，下面是Circuit for phase comparison专利的具体信息内容。

权利要求

1. A phaSe comparator circuit for synchronizing two pulse sequences, comprising: a first means for receiving a first sequence of pulses; a source of supply voltage; means for deriving a voltage threshold level from said supply voltage; a differential amplifier having a first input coupled to a delta voltage and a second input coupled to said threshold voltage; first and second series connected constant current sources coupled to the output of said differential amplifier; a transistor coupled to the common-emitter circuit of said differential amplifier, the base of said transistor controlled by said first sequence of pulses; and means for generating a control signal of one polarity when the momentary value of said delta voltage is higher than said voltage threshold level, and of an opposite polarity when said momentary value is less than said threshold level.

2. A phase comparator circuit according to claim 1 further including a filter circuit coupled to said two constant current sources, said filter circuit having a time constant capable of being adjusted in dependence upon the degree of synchronization.

3. A phase comparator circuit according to claim 1 further including a phase inverter preceeding said two series connected constant current sources.

4. A phase comparator circuit according to claim 1 wherein each of said constant current sources includes one transistor arranged complementary to the other.

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Circuit for phase comparison

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