Philips Semiconductors

Product specification

SA604A

High performance low power FM IF system

1997 Nov 07

8

42k

15

16

1

1.6k

40k

V+

70014

7k

SR00316

Figure 6. First Limiter Bias

11

12

10

40k

80k

8

40k

V+

9

42k

SR00317

Figure 7. Second Limiter and Quadrature Detector

BPF

BPF

SR00318

Figure 8. Feedback Paths

a. Terminating High Impedance Filters with Transformation to Low Impedance

b. Low Impedance Termination and Gain Reduction

BPF

HIGH IMPEDANCE

LOW IMPEDANCE

HIGH IMPEDANCE

BPF

BPF

RESISTIVE LOSS INTO BPF

BPF

A

SR00319

Figure 9. Practical Termination