|
Limiting Amplifier is Digitally Programmable: 06/04/98 EDN-Design Ideas / (added 11/05) Amplitude limiters are necessary in
many systems, such as radar and FM receivers, for which the system cannot allow the amplitude of the signal to exceed the given positive, negative, or both limits. In the circuit in Figure 1,
amplifier IC4B's maximum output is digitally programmable over ±2 to ±10V in 2n steps, where n is the number of bits of the DAC. IC1, a precision 10V reference, provides a full-scale reference
current, IREF=VREF/R1=2 mA, to IC2, a multiplying DAC. IC3's output voltage, VL, is the sum of the product of the digital word and unipolar... |