HA17741/PS
Vertical:
5 V/div
Horizontal: 0.5 ms/div
Test circuit condition
V
CC
= 15 V, V
EE
=
−15
V
R
1
= 110 kΩ, R
2
= 11 kΩ
C
1
= 0.0015
µF,
C
2
= 0.015
µF
Test results
f = 929.7 Hz, T.H.P = 0.06%
Figure 9 HA17741 Wien Bridge Sine Wave Oscillator Operating Waveform
Quadrature Oscillator
Sin out
C
T2
R
T2
A1
+
+
−
A2
Cos out
D
1
V
4
R
11
R
22
R
44
C
T1
−
R
T1
C
1
R
1
D
2
R
33
V
8
Figure 10 Quadrature Sine Wave Oscillator
Figure 10 shows the circuit diagram for a quadrature sine wave oscillator. This circuit consists of two
integrators and a limiter circuit, and provides not only a sine wave output, but also a cosine output, that is,
it also supplies the waveform delayed by 90°. The output amplitude is essentially determined by the limiter
circuit.
7