A/ D Converter and Logic-continued

Page Title: A/ D Converter and Logic-continued
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TM-11-6625-444-14-1 Voltmeter Digital AN/GSM-64B (NSN 6625-00-022-7894) (EIC: KPF) Plug-In Electronic Test Equipment PL-1370/GSM-64B Manual

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Figure 5-4. A/D converter block diagram

TM 11-6625-444-14-1

volts internal reference voltage output from the

Q32 operates as a second comparator, which

ratio input assembly and differential stage Q33,

responds quickly to high voltage levels, thereby

Q34 outputs to the current controlled oscillator

allowing maximum time for resolution of the least

(CCO) anytime the A/D amplifier output voltage

significant digit.

is greater than the +7 volts reference. Transistor

5-6