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Article: 1-Hz to 100-MHz VFC features 160-dB dynamic range.(design ideas)
- Article from:
- EDN
- Article date:
- September 1, 2005
- Author:
CopyrightCOPYRIGHT 2005 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The VFC (voltage-to-frequency-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 circuit'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/[degrees]C gain/temperature coefficient, a 1Hz/[degrees]C zero-point shift, and a 0.1% frequency shift for a 10% power-supply-voltage variation. A single 5V supply powers the circuit.
[FIGURE 1 OMITTED]
Chopper-stabilized amplifier ...
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