SA604A Datasheet, PDF (8/13 Pages) NXP Semiconductors – High performance low power FM IF system

Philips Semiconductors
High performance low power FM IF system
Product specification
SA604A
42k
15
16
1.6k
1
40k
V+
70014
7k
Figure 6. First Limiter Bias
SR00316
42k
11
12
10
40k
9
V+
40k
8
80k
SR00317
Figure 7. Second Limiter and Quadrature Detector
BPF
HIGH IMPEDANCE
BPF
BPF
Figure 8. Feedback Paths
SR00318
BPF
HIGH IMPEDANCE
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