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AD633ANZ データシート(PDF) 9 Page - Analog Devices |
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AD633ANZ データシート(HTML) 9 Page - Analog Devices |
9 / 16 page Data Sheet AD633 Rev. I | Page 9 of 16 Likewise, Figure 15 shows how to implement a divider using a multiplier in a feedback loop. The transfer function for the divider is ( ) X E E V W 10 − = ′ (6) AD633JN X1 1 X2 2 Y1 3 Y2 4 +VS 8 W 7 Z 6 –VS 5 0.1µF 0.1µF +15V 0.1µF +15V 0.1µF –15V –15V 7 4 3 6 2 AD711 E R 10kΩ R 10kΩ EX W' = –10V E EX Figure 15. Connections for Division VARIABLE SCALE FACTOR In some instances, it may be desirable to use a scaling voltage other than 10 V. The connections shown in Figure 16 increase the gain of the system by the ratio (R1 + R2)/R1. This ratio is limited to 100 in practical applications. The summing input, S, can be used to add an additional signal to the output, or it can be grounded. AD633JN X1 1 X2 2 Y1 3 Y2 4 +VS 8 W 7 Z 6 –VS 5 0.1µF 0.1µF +15V –15V W = S R1 R2 1kΩ ≤ R1, R2 ≤ 100kΩ + S (X1 – X2)(Y1 – Y2) 10V R1 + R2 R1 X INPUT Y INPUT + – + – Figure 16. Connections for Variable Scale Factor CURRENT OUTPUT The voltage output of the AD633 can be converted to a current output by the addition of a resistor, R, between the W and Z pins of the AD633 as shown in Figure 17. AD633JN X1 1 X2 2 Y1 3 Y2 4 +VS 8 W 7 Z 6 –VS 5 0.1µF 0.1µF +15V –15V IO = 1 R (X1 – X2)(Y1 – Y2) 10V 1kΩ ≤ R ≤ 100kΩ R X INPUT Y INPUT + – + – Figure 17. Current Output Connections This arrangement forms the basis of voltage-controlled integrators and oscillators as is shown later in this section. The transfer function of this circuit has the form ( )( ) V Y2 Y1 X2 X1 R IO 10 1 − − = (7) LINEAR AMPLITUDE MODULATOR The AD633 can be used as a linear amplitude modulator with no external components. Figure 18 shows the circuit. The carrier and modulation inputs to the AD633 are multiplied to produce a double sideband signal. The carrier signal is fed forward to the Z input of the AD633 where it is summed with the double sideband signal to produce a double sideband with the carrier output. AD633JN X1 MODULATION INPUT ±EM CARRIER INPUT EC sin ωt 1 X2 2 Y1 3 Y2 4 +VS 8 W 7 Z 6 –VS 5 + – 0.1µF 0.1µF +15V –15V W = EC sin ωt EM 10V 1+ Figure 18. Linear Amplitude Modulator VOLTAGE-CONTROLLED, LOW-PASS AND HIGH- PASS FILTERS Figure 19 shows a single multiplier used to build a voltage- controlled, low-pass filter. The voltage at Output A is a result of filtering, ES. The break frequency is modulated by EC, the control input. The break frequency, f2, equals ( ) RC V E f C 2 π = 20 (8) and the roll-off is 6 dB per octave. This output, which is at a high impedance point, may need to be buffered. 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 1 + T1P 1 + T2P OUTPUT B = 1 1 + T2P OUTPUT A = 1 W1 T1 = = RC 1 W2 10 ECRC T2 = = dB f2 f1 f –6dB/OCTAVE OUTPUT A OUTPUT B 0 Figure 19. Voltage-Controlled, Low-Pass Filter The voltage at Output B, the direct output of the AD633, has the same response up to frequency f1, the natural breakpoint of RC filter, and then levels off to a constant attenuation of f1/f2 = EC/10. RC f π = 2 1 1 (9) |
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