FIGURE 3 (on page 7) shows a PIR (passive infra-red) detector and its
associated amplifier, as used in burglar alarm systems1.
(a) The detector is powered from a 12 V unregulated supply that needs
to be stepped down to 5 V. Design a suitable 12-to-5 V voltage
converter using an op-amp and a diode that has the forward
characteristics given in FIGURE 3(b).
(b) Estimate the quiescent voltages at the inputs and outputs of the two
op-amps and the overall voltage gain (in decibels) of the circuit at the
frequency of operation. State any assumptions made.
Vo = GV (V+ – V–)
Vd = V+
The Attempt at a Solution
I think pic 2 is the circuit they are asking for.
as for the rest.
Any help would be appreciated.
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