User manual TYCO KYO8W

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Manual abstract: user guide TYCO KYO8W

Detailed instructions for use are in the User's Guide.

[. . . ] Terminals are also provided for use in applications requiring input offset voltage nulling. The use of PMOS field effect transistors in the input stage results in common mode input voltage capability down to 0. 5V below the negative supply terminal, an important attribute for single supply applications. The output stage uses bipolar transistors and includes built-in protection against damage from load terminal short circuiting to either supply rail or to ground. The CA3140 Series has the same 8-lead pinout used for the "741" and other industry standard op amps. [. . . ] Output from the switch is returned directly back to the input of the CA3080A current source, thereby, completing the positive feedback loop The triangular output level is determined by the four 1N914 level limiting diodes of the second CA3080 and the resistor divider network connected to Terminal No. These diodes establish the input trip level to this switching stage and, therefore, indirectly determine the amplitude of the output triangle. Compensation for propagation delays around the entire loop is provided by one adjustment on the input of the CA3080. This adjustment, which provides for a constant generator amplitude output, is most easily made while the generator is sweeping. High frequency ramp linearity is adjusted by the single 7pF to 60pF capacitor in the output of the CA3080A. It must be emphasized that only the CA3080A is characterized for maximum output linearity in the current generator function. Sine Wave Shaper The circuit shown in Figure 12 uses a CA3140 as a voltage follower in combination with diodes from the CA3019 Array to convert the triangular signal from the function generator to a sine-wave output signal having typically less than 2% THD. The basic zero crossing slope is established by the 10k potentiometer connected between Terminals 2 and 6 of the CA3140 and the 9. 1k resistor and 10k potentiometer from Terminal 2 to ground. Two break points are established by diodes D1 through D4. Positive feedback via D5 and D6 establishes the zero slope at the maximum and minimum levels of the sine wave. This technique is necessary because the voltage follower configuration approaches unity gain rather than the zero gain required to shape the sine wave at the two extremes. Meter Driver and Buffer Amplifier Figure 11 shows the CA3140 connected as a meter driver and buffer amplifier. Low driving impedance is required of the CA3080A current source to assure smooth operation of the Frequency Adjustment Control. Rates and slopes, as well as sawtooth, triangle, and logarithmic sweeps are generated by this circuit. Wideband Output Amplifier Figure 14 shows a high slew rate, wideband amplifier suitable for use as a 50 transmission line driver. This circuit, when used in conjunction with the function generator and sine wave shaper circuits shown in Figures 10 and 12 provides 18VP-P output open circuited, or 9VP-P output when terminated in 50. The slew rate required of this amplifier is 28V/µs (18VP-P x x 0. 5MHz). +15V SIGNAL LEVEL ADJUSTMENT 2. 5k 200 3 2 REFERENCE VOLTAGE INPUT VOLTAGE ADJUSTMENT 3 + 7 6 REGULATED OUTPUT CA3140 2 - 4 FIGURE 15. BASIC SINGLE SUPPLY VOLTAGE REGULATOR SHOWING VOLTAGE FOLLOWER CONFIGURATION Essentially, the regulators, shown in Figures 16 and 17, are connected as non inverting power operational amplifiers with a gain of 3. 2. An 8V reference input yields a maximum output voltage slightly greater than 25V. As a voltage follower, when the reference input goes to 0V the output will be 0V. Because the offset voltage is also multiplied by the 3. 2 gain factor, a potentiometer is needed to null the offset voltage. Series pass transistors with high ICBO levels will also prevent the output voltage from reaching zero because there is a finite voltage drop (VCESAT) across the output of the CA3140 (see Figure 2). This saturation voltage level may indeed set the lowest voltage obtainable. The high impedance presented by Terminal 8 is advantageous in effecting current limiting. [. . . ] When the equality of the two equations shown in Figure 26 is satisfied, the full wave output is symmetrical. NOTE: 14. "Operational Amplifiers Design and Applications", J. Graeme, McGraw-Hill Book Company, page 308, "Negative Immittance Converter Circuits". Top Trace: Output Signal; 5V/Div, 2µs/Div. Center Trace: Difference of Input and Output Signals through Tektronix Amplifier 7A13; 5mV/Div. , 2µs/Div. [. . . ]

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