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AD633 Datasheet(PDF) 12 Page - Analog Devices |
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AD633 Datasheet(HTML) 12 Page - Analog Devices |
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12 / 21 page  Data Sheet AD633 Rev. J | Page 11 of 20 For example, if R = 8 kΩ and C = 0.002 µF, then Output A has a pole at frequencies from 100 Hz to 10 kHz for EC ranging from 100 mV to 10 V. Output B has an additional 0 at 10 kHz (and can be loaded because it is the low impedance output of the multiplier). The circuit can be changed to a high-pass filter Z interchanging the resistor and capacitor as shown in Figure 21. AD633JN X1 1 X2 2 Y1 3 Y2 4 +VS 8 W 7 Z 6 –VS 5 CONTROL INPUT EC SIGNAL INPUT ES 0.1µF 0.1µF +15V –15V R C OUTPUT B OUTPUT A dB f1 f2 f +6dB/OCTAVE OUTPUT A OUTPUT B 0 Figure 21. Voltage-Controlled, High-Pass Filter VOLTAGE-CONTROLLED QUADRATURE OSCILLATOR Figure 22 shows two multipliers being used to form integrators with controllable time constants in second-order differential equation feedback loop. R2 and R5 provide controlled current output operation. The currents are integrated in capacitors C1 and C2, and the resulting voltages at high impedance are applied to the X inputs of the next AD633. The frequency control input, EC, connected to the Y inputs, varies the integrator gains with a calibration of 100 Hz/V. The accuracy is limited by the Y input offsets. The practical tuning range of this circuit is 100:1. C2 (proportional to C1 and C3), R3, and R4 provide regenerative feedback to start and maintain oscillation. The diode bridge, D1 through D4 (1N914s), and Zener diode D5 provide economical temperature stabilization and amplitude stabilization at ±8.5 V by degenerative damping. The output from the second integrator (10 V sin ωt) has the lowest distortion. AUTOMATIC GAIN CONTROL (AGC) AMPLIFIERS Figure 23 shows an AGC circuit that uses an rms-to-dc converter to measure the amplitude of the output waveform. The AD633 and A1, ½ of an AD712 dual op amp, form a voltage-controlled amplifier. The rms-to-dc converter, an AD736, measures the rms value of the output signal. Its output drives A2, an integrator/comparator whose output controls the gain of the voltage-controlled amplifier. The 1N4148 diode prevents the output of A2 from going negative. R8, a 50 kΩ variable resistor, sets the output level of the circuit. Feedback around the loop forces the voltages at the inverting and noninverting inputs of A2 to be equal, thus the AGC. AD633JN X1 1 X2 2 Y1 3 Y2 4 +VS 8 W 7 Z 6 –VS 5 0.1µF 0.1µF C1 0.01µF +15V –15V AD633JN X1 1 X2 2 Y1 3 Y2 4 +VS 8 W 7 Z 6 –VS 5 0.1µF +15V –15V R5 16kΩ R3 330kΩ R4 16kΩ C3 0.01µF C2 0.01µF (10V) sin ωt 0.1µF R2 16kΩ R1 1kΩ D5 1N5236 D1 1N914 D2 1N914 D3 1N914 D4 1N914 f = EC 10V = kHz (10V) cos ωt EC Figure 22. Voltage-Controlled Quadrature Oscillator |
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