Digital-to-analogue mixed signal loop pressure-control oscillator with technology error compensation
A voltage-controlled oscillator, digital-analog hybrid technology, applied in the field of phase-locked loops
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[0019] figure 1 It is a block diagram of a digital-analog mixed signal loop voltage-controlled oscillator with process error compensation proposed by the present invention. It has analog signal input terminal Ca; digital signal input terminal C0', C0, C1, C2, ... Cn; process error compensation control terminal P1, ... Pm. In principle, m can be any integer greater than or equal to 1, but in practical applications Among them, m=1 or m=2 is generally taken, that is, there are only one or two process error compensation control terminals; two anti-phase signal frequency output terminals Fout and Fout. The principle of digital preset or digital rough adjustment is: input a group of digital signals Cn…C2 C1 C0C0’, through the internal control circuit, the voltage-controlled oscillator immediately outputs a signal frequency that is very close to the expected signal frequency. However, due to the production process error, the VCO output signal frequency may have a large deviation. At...
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