X and Y Deflection Amplifiers, Circuit Description
(Serial Number Prefixes:
X Deflection Amplifier and
Y Deflection Amplifier each consists of a differential
input state
Q15) with current source Qll, two current gain stages
Q14 and
and two output differential current-to-voltage amplifiers. A display output amplifier
provides rear-panel X and Y DISPLAY OUTPUTS.
Current Amplifier (B)
The Current Amplifier transforms an input voltage change to a differential current change at
the collectors of
and Q15. This change is amplified in the following current gain stages
and Q14. POSN adjust R7 sets the CRT trace position, and GAIN adjust R27 sets the
CRT trace deflection limits.
The collectors of and
are virtual-ground, current-summing junctions of the output
amplifiers. When a signal is applied so as to increase the current in (decrease in Q13)
Q5 conducts more, turning off Q2 and causing the output (collector of Q2) to rise. Current
feedback through R29 supplies the increase in current required by
The analogous
operation, with inverted polarity, occurs in the other output amplifier.
Current to Voltage Amplifiers (C) (D)
Emitter followers Q7 and Q12 are feedforward amplifiers, coupling the drive signal directly to
the bases of and Q4, thus improving the frequency response. Trimmer capacitors
and
along with HF GAIN potentiometer R28, adjust the amplifier frequency response for
minimum overshoot and equal risetimes
ns).
An input signal of 0 V to 2 V peak will cause a beam deflection equal to the length of the
graticule lines.
Display Output (A)
Display output amplifier provides a 1 V maximum rear-panel signal to the X and Y
DISPLAY OUTPUTS.
Содержание 85662A
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