Band adjustment device of polyphase filter and band adjustment method of polyphase filter
AssigneeNEC Corporation
InventorHiroshi Kodama
Life of this patent
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Abstract
Provided is a base adjustment device and method of a polyphase filter that can reduce an area and power consumption, and operate at a high speed. The band adjustment device of the polyphase filter according to the present invention includes a voltage-controlled oscillator (VCO), a polyphase filter that inputs an output from the VCO, a mixer that receives an output from the polyphase filter, an envelope detection circuit (envelope detector) that inputs an output from the mixer, and a band control signal generation circuit that inputs an output from the envelope detector.
Claims27
A band adjustment device of a polyphase filter comprising:
- a voltage controlled oscillator that generates a clock signal;
- a polyphase filter that receives the clock signal output from the voltage controlled oscillator and outputs a four-phase signal;
- a mixer that receives the four-phase signal output from the polyphase filter and an external test signal;
- an envelope detection circuit that receives a signal output from the mixer;
- and
- a band control signal generation circuit that receives a signal output from the envelope detection circuit and generates a band control signal for controlling a band of the polyphase filter.
A band adjustment method of a polyphase filer comprising:
- a step performed by a voltage controlled oscillator of generating a clock signal;
- a step performed by a polyphase filter of receiving the clock signal output from the voltage controlled oscillator and outputting a four-phase signal;
- a step performed by a mixer of receiving the four-phase signal output from the polyphase filer and an external test signal;
- a step performed by an envelope detection circuit of receiving a signal output from the mixer;
- and
- a step performed by a band control signal generation circuit of receiving a signal output from the envelope detection circuit and generating a band control signal that controls a band of the polyphase filter.
Dependencies are inferred from the claim text.