1-Hz to 100-MHz VFC features 160-dB dynamic range

摘要

The VFC (voltage-to-frequen-cy-converter) circuit in Figure 1 achieves a wider dynamic range and a higher full-scale output frequency— 100 MHz with 10% overrange to 110 MHz—by a factor of 10 over any commercially available converter. The cir-cuit's 160-dB dynamic range spans eight decades for a 0 to 5V input range and allows continuous operation down to 1 Hz. Additional specifications include 0.1% linearity, a 250-ppm/℃ gain/temperature coefficient, a 1-Hz/℃ zero-point shift, and a 0.1% frequency shift for a 10% power-supply-voltage variation. A single 5V supply powers the circuit.