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LM1203B データシート(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1203B
部品情報  100 MHz RGB Video Amplifier System
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1203B データシート(HTML) 10 Page - National Semiconductor (TI)

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Circuit Description (Continued)
CLAMP GATE AND CLAMP
COMPARATOR SECTION
Figures 8 and 9 show simplified schematics of the clamp
gate and clamp comparator circuits The clamp gate circuit
(Figure 8) consists of a PNP input buffer transistor (Q46) a
PNP emitter coupled pair (Q47 and Q49) referenced on one
side to 21V and an output switch transistor Q53 When the
clamp gate input at pin 14 is high (l15V) the Q53 switch is
on and shunts the 200 mA current from current source Q54
to ground When pin 14 is low (k 13V) the Q53 switch is off
and the 200 mA current is mirrored by the current mirror
comprised of Q55 and Q36 (see
Figure 9 ) Consequently
the clamp comparator comprised of the differential pair Q35
and Q37 is enabled The input of each clamp comparator is
similar to the clamp gate except that an NPN emitter cou-
pled pair is used to control the current that will charge or
discharge the clamp capacitors at pins 5 8 and 10 PNP
transistors are used at the inputs because they offer a num-
ber of advantages over NPNs PNPs will operate with base
voltages at or near ground and will usually have a greater
emitter base breakdown voltage (BVebo) Because the dif-
ferential input voltage to the clamp comparator during the
video scan period could be greater than the BVebo of NPN
transistors a resistor (R37) with a value one half that of R36
or R39 is connected between the bases of Q34 and Q38
The clamp comparator’s common mode range is from
ground to approximately 9V and the maximum differential
input voltage is VCC and ground
TLH11489 – 12
FIGURE 8 Simplified Schematic of LM1203B Clamp Gate Circuit
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