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MC1495BP Fiches technique(PDF) 8 Page - ON Semiconductor |
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MC1495BP Fiches technique(HTML) 8 Page - ON Semiconductor |
8 / 16 page MC1495 http://onsemi.com 8 Maximum Output Voltage Swing The maximum output voltage swing is dependent upon the factors mentioned below and upon the particular circuit being considered. For Figure 20 the maximum output swing is dependent upon V+ for positive swing and upon the voltage at Pin 1 for negative swing. The potential at Pin 1 determines the quiescent level for transistors Q5, Q6, Q7 and Q8. This potential should be related so that negative swing at Pins 2 or 14 does not saturate those transistors. See General Design Procedure for further information regarding selection of these potentials. RX RY I3 56 10 RX RY 11 RI RL RL 2 1 14 VO 9 12 4 8 3 I3 13 7 R13 R3 V- V+ VX VY VO = K VX VY K = 2RL MC1495 + + + - - - Figure 20. Basic Multiplier If an operational amplifier is used for level shift, as shown in Figure 21, the output swing (of the multiplier) is greatly reduced. See Section 3 for further details. GENERAL DESIGN PROCEDURE Selection of component values is best demonstrated by the following example. Assume resistive dividers are used at the X and Y-inputs to limit the maximum multiplier input to ± 5.0 V [VX = VY(max)] for a ± 10 V input [VX′ = VY′(max)] (see Figure 21). If an overall scale factor of 1/10 is desired, VO = VX′ VY′ 10 = (2VX) (2VY) 10 = 4/10 VX VY then, Therefore, K = 4/10 for the multiplier (excluding the divider network). Step 1. The fist step is to select current I3 and current I13. There are no restrictions on the selection of either of these currents except the power dissipation of the device. I3 and I13 will normally be 1.0 mA or 2.0 mA. Further, I3 does not have to be equal to I13, and there is normally no need to make them different. For this example, let I3 = I13 = 1.0 mA. 5 RX 10 k RY 10 k 11 10 RL 18 k 5.0 k P4 Output Offset Adjust 10 k R13 12 k I3 4 9 13 8 12 14 2 + - + + 10 k VY′ VY VX MC1495 MC1741C P1 P2 10 k 2.0 k -15 V +15 V 5.1 V 2 3 7 4 6 5 1 + - 20 k RL 0.1 µF +15 V R0 3.0 k R0 3.0 k R1 3.0 k 1 7 - 15 V - 15 V 3 I13 10 k 10 k 10 k 6 0.1 µF 2.0 k Y Offset Adjust Scale Factor Adjust R3 -10V ≤ VX ≤ +10V -10V ≤ VY ≤ +10V 12 k 5.0 k P3 X Offset Adjust VO = -VX VY 10 VX′ Figure 21. Multiplier with Operational Amplifier Level Shift 5.1 V |
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