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THS4631DR Datasheet(PDF) 11 Page - Texas Instruments |
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THS4631DR Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 27 page  www.ti.com 65 70 75 80 85 10 k 100 k 1 M 10 M 1 G f − Frequency − Hz VS = ±15 V RL = 1 k RF = 10 k CS = 100 PF CF = 3 PF CS = 18 PF CF = 2 PF CS = 47 PF CF = 2.2 PF 50 W 50 W RS VS C1 C2 IO Network Analizer I O V S (s) + 1 2 R S 1 ) C1 C2 (Above the Pole Frequency) I O V S (s) + s 2 R S 1) C1 C2 s ) 1 2 R S C1)C2 (3) 85 90 95 100 105 10 k 100 k 1 M 10 M 1 G f − Frequency − Hz VS = ±15 V RL = 1 k RF = 100 k CS = 47 PF CF = 0.7 PF CS = 100 PF CF = 1 PF CS = 18 PF CF = 0.5 PF at: 1 2 R S (C1 ) C2) . The transconductance is constant at: 1 2 R S 1 ) C1 C2 , above the pole frequency, provid- 95 100 110 120 10 k 100 k 1 M 10 M f − Frequency − Hz 125 VS = ±15 V RL = 1 k RF = 1 M 115 105 CS = 18 PF CF = 0 PF CS = 47 PF CF = 0.2 PF CS = 100 PF CF = 0.2 PF Z O(s) + C1 ) C2 C1 C2 s ) 1 2 R S C1)C2 s s ) 1 2 R S C1 (4) MEASURING TRANSIMPEDANCE Z O [ 1 s C2 , giving the appearance of a capacitive THS4631 SLOS451A – DECEMBER 2004 – REVISED MARCH 2005 10-k Ω TRANSIMPEDANCE RESPONSES current as an input rather than a voltage. Also, the capacitance of the current source has a direct effect on the frequency response. A simple interface circuit can be used to emulate a capacitive current source with a network analyzer. With this circuit, transimpedance bandwidth measurements are simpli- fied, making amplifier evaluation easier and faster. Figure 35. A. The interface network creates a capacitive, constant current source from a network 100-k Ω TRANSIMPEDANCE RESPONSES analyzer and properly terminates the net- work analyzer at high frequencies. Figure 38. Emulating a Capacitive Current Source With a Network Analyzer The transconductance transfer function of the interface circuit is: The transfer function contains a zero at dc and a pole Figure 36. 1-M Ω TRANSIMPEDANCE RESPONSES ing a controllable ac-current source. This circuit also properly terminates the network analyzer with 50 Ω at high frequencies. The second requirement for this current source is to provide the desired output im- pedance, emulating the output impedance of a photodiode or other current source. The output im- pedance of this circuit is given by: Figure 37. Assuming C1 >> C2, the equation reduces to: BANDWIDTH source at a higher frequency. While there is no substitute for measuring the per- formance of a particular circuit under the exact Capacitor values should be chosen to satisfy two conditions that are used in the application, the com- requirements. First, C2 represents the anticipated plete system environment often makes measure- capacitance of the true source. Second C1 is chosen ments harder. For transimpedance circuits, it is diffi- such that the corner frequency of the cult to measure the frequency response with tradition- transconductance network is much less than the al laboratory equipment because the circuit requires a transimpedance bandwidth of the circuit. Choosing 11 |
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