Philips Semiconductors
Product specification
High performance low power FM IF system
SA604A
42k
V+
15
16
1.6k
1
40k
BPF
BPF
7k
70014
SR00316
Figure 6. First Limiter Bias
SR00318
42k
9
Figure 8. Feedback Paths
V+
40k
8
11
12
10
40k
80k
SR00317
Figure 7. Second Limiter and Quadrature Detector
HIGH IMPEDANCE
BPF
HIGH IMPEDANCE
BPF
LOW IMPEDANCE
a. Terminating High Impedance Filters with Transformation to Low Impedance
BPF
A
BPF
RESISTIVE LOSS INTO BPF
b. Low Impedance Termination and Gain Reduction
Figure 9. Practical Termination
SR00319
1997 Nov 07
8