Linear Class H
CIC Size Hybrid
GS3034 - DATA SHEET
FEATURES
鈥?complete linear system
鈥?current mode class H output stage
鈥?current drive power amp
鈥?low distortion / low noise
鈥?low amplifier current 190
碌
A typical
鈥?small size for CIC applications
STANDARD PACKAGING
鈥?Hybrid Typical Dimensions (0.180in x 0.075in x 0.055in)
(4.57mm x 1.91mm x 1.40mm)
鈥?Hybrid View
DESCRIPTION
The GS3034 hybrid offers Gennum鈥檚 new innovative class H
output stage along with two low noise inverting preamplifiers,
in a CIC size package.
V
B
10
This new breed of output stage adapts the bias current of the
receiver to the user's listening environment. In relatively loud
environments the receiver will be fully biased similar to a
traditional class A amplifier. However, as the loudness of the
environment decreases, the bias current of the receiver adjusts
to a minimum level required to cleanly pass the signal. At the
same time the system maintains adequate 鈥渉eadroom鈥?should
the amplitude of the signal suddenly increase. By adapting
the bias of the output stage to the requirements of the signal
being processed, significant current savings can be realized
compared to traditional class A amplifiers.
The rate at which the bias adapts is associated with a capacitor
connected from pad CC of the hybrid to ground. For optimum
performance it is recommended that a 0.22
碌F
capacitor be
used.
The two low noise preamplifiers Stage A and Stage B, can be
used as Volume Control and Gain Trim elements or Stage A as
a filter shaping element and Stage B as the Volume Control. As
the output stage is current drive, frequency shaping is relatively
easy via the addition of a capacitor across the receiver.
CC
5
V
B
V
REG
3
C1
0碌1
2
C2
0碌1
12k
V
REG
REGULATOR
CONTROL
24k
V
B
IN
- A
12k
-
B
+
C
-
-
+
170
9 OUT
8 R
E
C4
15n
C3
0碌1
GS3034
11
A
IN
All resistors in ohms, all capacitors
in farads unless otherwise stated.
12
1
7
B
IN
6
B
OUT
4
GND
A
OUT
B
RIN
FUNCTIONAL BLOCK DIAGRAM
Revision Date: December 1998
Document No. 521 - 51 - 04
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996
Web Site: www.gennum.com E-mail: hipinfo@gennum.com
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