Dual-loop compensation orthogonal signal source phase noise restraining circuit based on lock-in amplifier
A lock-in amplifier, compensation and suppression technology, applied in the direction of improving the amplifier to reduce the influence of noise, etc., to achieve the effect of improving the accuracy
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[0018] Embodiments of the invention will be described below with reference to the drawings.
[0019] A dual-loop compensation circuit based on a lock-in amplifier to suppress signal source phase noise, figure 1 It is a block diagram of the circuit structure of the present invention, including: comparator 1, #1 low-pass filter 2, integrator 3, 1 / 2V os Measuring circuit 4, phase-sensitive detection 5, frequency and phase detector 6, #2 low-pass filter 7, voltage-controlled oscillator 8, 1 / 4 frequency divider 9. Among them, comparator 1, #1 low-pass filter 2, integrator 3, 1 / 2V os Measuring circuit 4 and phase-sensitive detection 5 form a phase noise measurement and compensation loop; frequency and phase detector 6, #2 low-pass filter 7, voltage-controlled oscillator 8, and 1 / 4 frequency divider 9 form a digital phase-locked loop.
[0020] In specific implementation, the phase noise measurement and compensation loop is constituted as figure 2 , 1 / 4 frequency divider 9 output ...
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