Digital processing device improving phase lock frequency modulation circuit broadband modulation flatness
A frequency modulation circuit and digital processing technology, applied in the direction of electrical components, automatic power control, power oscillator, etc., can solve problems such as broadband modulation flat characteristics affecting phase-locked frequency modulation circuits, and overcome the effects of temperature drift and time drift. , improved impact, high precision effect
Active Publication Date: 2015-02-25
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
The temperature drift and time drift of the integral time constant of the analog integrator will affect the flat characteristics of the broadband modulation of the phase-locked frequency modulation circuit
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[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.
[0012] The present invention adopts a digital processing device and a known phase-locked frequency modulation circuit. The digital processing device includes a high-speed A / D converter, an FPGA programmable logic device, a high-speed D / A converter A, a high-speed D / A converter B, an analog low-pass filter, a reference voltage source, and the like.
[0013] The FPGA programmable logic device is connected with a high-speed A / D converter, a high-speed D / A converter A, a high-speed D / A converter B, a voltage-controlled oscillator and a frequency synthesizer chip. The IO port of the FPGA programmable logic device is connected to the digital input terminals of the high-speed D / A converter A and the high-speed D / A converter B in a one-to-one connection, that is, one IO port of the...
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The invention provides a digital processing device improving phase lock frequency modulation circuit broadband modulation flatness. An FPGA carries out cache filtering processing on original baseband signals, and outputs the baseband signals A to a high-speed A / D converter; A / D quantized data output by the high-speed A / D converter are received, one path of data is output to a low pass filter module, and the other path of data is delayed and then output to a high-speed D / A converter B; the low pass filter module carries out low pass filtering on the A / D quantized data and outputs the filtered A / D quantized data to a high-speed D / A converter A to be changed into baseband signals B, and the baseband signals B are converted by an analog low pass filter into baseband signals C to be output to a loop lower pass filter; the high-speed D / A converter B converts the A / D quantized data into baseband signals D which are output to a voltage-controlled oscillator. According to the digital processing device improving phase lock frequency modulation circuit broadband modulation flatness, the response stability of a phase lock frequency modulation circuit for a baseband signal low frequency component can be improved, and the phase lock frequency modulation circuit has the broadband modulation performance with the stable flatness feature.
Description
technical field [0001] The invention relates to a digital signal processing technology, in particular to a digital processing device for baseband signal processing of a phase-locked frequency modulation circuit. Background technique [0002] In the known two-point injection phase-locked frequency modulation circuit, the baseband processing circuit is an analog integrator circuit composed of operational amplifiers and lumped parameter components. The integration time constant of the analog integrator is determined by the resistance and capacitance in the circuit, and the resistance and capacitance values change with the ambient temperature and usage time, so the integration time constant of the analog integrator also varies with the ambient temperature and usage time, which is called analog integration Temperature drift and time drift of the integral time constant of the device. The temperature drift and time drift of the integral time constant of the analog integrator wil...
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Login to View More IPC IPC(8): H03L7/08H03L7/18H03B5/04
Inventor 孙文友段哲民祝小平宋祖勋胡永红张小林
Owner NORTHWESTERN POLYTECHNICAL UNIV