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Transimpedance Networks

3-11

EVM Applications

Figure  3-13. Single Real Pole and Single Real Zero (Second Configuration)

R4

Z5

X

Iout

Imag

O

Vin

Real

Z4

Figure  3-14. Two Real Poles, One Real Zero

Imag

Z5

Real

Vin

Z4

X

X

R4

O

Iout

Figure  3-15. One Real Pole, Two Complex Zeros

X

Iout

R4

Vin

Z4

Real

O

Z5

Z6

Imag

O

Summary of Contents for THS4601EVM

Page 1: ...THS4601EVM October 2002 High Performance Linear Products User s Guide SLOU150...

Page 2: ...t that any license either express or implied is granted under any TI patent right copyright mask work right or other TI intellectual property right relating to any combination machine or process in wh...

Page 3: ...handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s r...

Page 4: ...e EVM Please consult the EVM User s Guide prior to connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal ope...

Page 5: ...provided for your protection Please read each caution and warning carefully FCC Warning This equipment is intended for use in a laboratory test environment only It gen erates uses and can radiate rad...

Page 6: ...ual Texas Instruments applications apologizes if they change over time THS4601 data sheet literature number SLOS388 Application report literature number SLMA002 Power Pad Thermally Enhanced Package ht...

Page 7: ...1 Evaluation Schematic 1 2 2 Using the EVM 2 1 3 EVM Applications 3 1 3 1 Noninverting Gain Stages 3 1 3 2 Inverting Gain Stages 3 3 3 3 Transimpedance Amplifier 3 4 3 4 T Network Gain Stages 3 8 3 5...

Page 8: ...Wideband Photodiode Transimpedance Amplifier 3 5 3 6 Parasitic Capacitances in Photodiode Applications 3 6 3 7 Transimpedance Circuit Bode Plot 3 7 3 8 Transimpedance Gains 3 8 3 9 Simplified EVM Sch...

Page 9: ...latform for testing the THS4601 in 8 pin SOIC PowerPADt DDA package It contains the high speed op amp a number of passive components and various features and footprints that enable the user to experim...

Page 10: ...rting input Z1 through Z3 for ac coupling Nominal 50 input impedance R2 or R1 Termination can be configured according to the application requirement 1 k load resistor R8 1 k is the standard data sheet...

Page 11: ...22 F J3 Vout Z4 C3 22 F R7 R6 C5 1000 pF C2 100 pF Z5 100 TP1 J2 Vin C4 0 1 F C8 1000 pF TP2 J5 GND R5 U1 THS4601 6 C1 100 pF VS R2 49 9 R8 1 k Z1 0 Z6 J4 VS FB2 FB1 Z3 49 9 VS C7 0 1 F VS VS J7 Vref...

Page 12: ...hows how to connect power supplies signal source and monitor ing instrument It is recommended that the user connect the EVM as shown to avoid damage to the EVM or the op amp installed on the board Fig...

Page 13: ...1 Default Configuration DC Coupled Dual Power Supply Noninverting Gain Stage R2 49 9 Z1 0 VS U1 THS4601 2 3 6 7 4 Z3 49 9 R3 100 J2 Vin TP3 Vout R8 1 k Z5 100 R1 0 VS J3 Vout Z2 0 Power supply decoup...

Page 14: ...h R7 are selected to produce a dc potential on the noninverting input equal or close to VS divided by 2 The THS4601 has low input bias currents which allow larger bias setting resistors If the user pr...

Page 15: ...ential due to the action of the ideal op amp model Figure 3 4 AC Coupled Single Power Supply Inverting Gain Stage U1 THS4601 2 7 VS J1 Vin Z1 R1 64 9 R3 100 Z5 100 R6 R7 R5 R2 0 Z2 J7 Vref VS 3 4 6 TP...

Page 16: ...er tube amplifiers Due to the capacitance associated with the transducer a pole has to be created in the feedback loop to ensure stability The wide bandwidth and high operating voltage capability of t...

Page 17: ...rce typically sets the requirements for gain speed and dynamic range of the amplifier For a given amplifier and source combination achievable performance is dictated by the following parameters the am...

Page 18: ...erential input capacitance CD is the diode capacitance CP is parasitic capacitance at the inverting node As shown in Figure 3 7 the feedback capacitor provides a pole in the noise gain of the circuit...

Page 19: ...re summarized numerically in the data sheet SLOS388 Note that the feedback capacitances do not correspond exactly with the values predicted by the equation They have been tuned to account for the para...

Page 20: ...z Transimpedance Gain dB 100 k TRANSIMPEDANCE BANDWIDTH FOR VARIOUS SOURCE CAPACITANCES 90 95 100 105 110 115 120 125 130 10 k 100 k 1 M 10 M CS 18 pF CF 0 CS 47 pF CF 0 CS 100 pF CF 0 CS 220 pF CF 0...

Page 21: ...fied by the second term The second term is a voltage divider on the output voltage multiplied by a gain term formed by R4 and R3 When the T network is used for noninverting gain as shown in Figure 3 1...

Page 22: ...f poles and zeros Pole zero filter design is beyond the scope of this EVM manual There are many excellent textbooks on the subject that the reader should consult Figures 3 11 through 3 15 show some of...

Page 23: ...3 13 Single Real Pole and Single Real Zero Second Configuration R4 Z5 X Iout Imag O Vin Real Z4 Figure 3 14 Two Real Poles One Real Zero Imag Z5 Real Vin Z4 X X R4 O Iout Figure 3 15 One Real Pole Tw...

Page 24: ...R6 R7 R9 Z4 Z6 7 8 Resistor 0 1 8 W 1 0805 Z1 Z2 2 Phycomp 9C08052A0R00JLHFT Garrett 9C08052A0R00JLHFT 9 Resistor 100 1 8 W 1 0805 R3 Z5 2 Phycomp 9C08052A1000FKHFT Garrett 9C08052A1000FKHFT 10 Open...

Page 25: ...4 2 Figure 4 1 Board Layout Views Top Bottom...

Page 26: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments THS4601EVM...

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