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
(Hz)
100 K
1M
5M
10 M
10 M
10 M
SIG LVL INS LOSS OFF ISOL XTALK
(dBm)
(dB)
(dB)
(dB)
0
0
0
0
6
12
1.8
1.8
1.9
2.0
2.0
2.0
80
70
69
61
61
61
113
92
69
65
66
68
Table 2. SPDT Switching Performance
16 V
10 pF
C1
Signal 1
-0 V
510
Ω
16
8.3 V
G4
14
510
Ω
13
11
G3
Signal 2
12 2 9
Signal 1
V
OUT
-8 V
Signal 2
16 V
0.1 µF
510
Ω
5
6
8
120 pF
Figure 15. The Two Analog Signals to Be
Sampled
G2
8.3 V
1
G1
3
4
10 pF
C2
-8 V
0.1 µF
V
OUT
G3
510
Ω
V
OUT
G3
Figure 14. 5-MHz Multiplexer and Sample and
Hold Circuit
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
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
