oscillation. The frequency of operation is determined by the LC in the Q3-Q5 collector line. The LF353 FET amplifier provides gain and buffering. Power supply dependence is eliminated by the zener diode and the LF353 unity gain follower. This circuit starts quickly and distortion is inside 1.5%. SNOA665C–October
oscillation. The frequency of operation is determined by the LC in the Q3-Q5 collector line. The LF353 FET amplifier provides gain and buffering. Power supply dependence is eliminated by the zener diode and the LF353 unity gain follower. This circuit starts quickly and distortion is inside 1.5%. SNOA665C–October
er26ofintegrator24,whichmay referencesignaliseliminated from the input tohigh be, for example, a type LF353 device commercially voltageoutput30and thereforefrom thecircuitcom available from National Semiconductor Corporation, monvoltagesothatthereferencefrequencysignalwill has an output 140 which sconnected
that slew one or both ends of the internal voltage divider terminated at quickly, such as the LF351, LF353 or LF356, are needed to relatively high value resistors. These high-impedance ends faithfully respond to sudden transients. It may be necessary should be bypassed to pin 2 with 0.1 µF. to trim out
significant error at the low end of the log display. Op amps that slew quickly, such as the LF351, LF353, or LF356, are needed to faithfully respond to sudden transients. It may be necessary to trim out the op amp DC offset voltage to accurately cover a 60 dB range. Best results are obtained if the circuit
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