The timing and amplitude of gate 2 and gate 3
control-signals can be examined in Figure 17.
Figure 18 shows a single-pole single-throw
configuration used to select one of two AM
modulated 10-MHz signals. Figure 19
illustrates the two waveforms available at the
output. Table 2 contains typical values of
crosstalk and off-isolation attainable with this
configuration.
FREQ SIG LVL INS LOSS OFF ISOL XTALK
(Hz) (dBm) (dB)
(dB)
(dB)
100 K
0
1.8
80
113
1M
0
1.8
70
92
5M
0
1.9
69
69
10 M
0
2.0
61
65
10 M
6
2.0
61
66
10 M
12
2.0
61
68
Table 2. SPDT Switching Performance
8.3 V
510 Ω
16 V
510 Ω
10 pF
C1
16
G4
14
13
G3
11
12 2 9
Signal 1
0.1 µF
8.3 V
510 Ω
-8 V
16 V
510 Ω
Signal 2
58
6
G2
1
G1
3
4
10 pF
C2
-8 V
0.1 µF
VOUT
120 pF
Figure 14. 5-MHz Multiplexer and Sample and
Hold Circuit
Signal 1
-0 V
Signal 2
Figure 15. The Two Analog Signals to Be
Sampled
VOUT
G3
VOUT
G3
Figure 16. Composite Sample and Hold Output
and the Gate 3 Control Signal
9
Linear Integrated Systems, Inc. ● 4042 Clipper Ct. ● Fremont, CA 94538 ● Tel: 510 490-9160 ● Fax: 510 353-0261