ECE351 Exam 3 Winter

Transcription

1 ECE351 Exam 3 Winter 212 PROBLEM 1: (2 Points) Find the midband gain V O /V in in the circuit below. Vcc R1 Q1 Vo V4 I1 R2 Vin Vee PROBLEM 2: (2 Points) Find the midband gain V OUT /V in in the circuit below. Vin R R(A1) Load Vout AR R PROBLEM 3: (2 Points) a) Add resistors to the circuit of Problem 2 to eliminate the effects of bias currents. b) Assuming that A O = 3 MHz and a = 1 Hz, find the upper 3 db frequency of each opamp. c) What is the overall upper 3 db Frequency for the gain V OUT /V in?

2 PROBLEM 4: (2 Points) 15 R3 D1 VZK=1.25 Volts R Load Assume that the Zener is broken down and has a voltage of 1.25 volts across it. Find an equation for the current through the load. PROBLEM 5: (2 Points) Find A O and a for the MAX4124. Data sheets and PSpice simulations are attached.

3 19187; Rev ; 8/96 Single/Dual/Quad, WideBandwidth, LowPower, SingleSupply RailtoRail I/O Op Amps General Description The MAX4122 MAX4129 family of operational amplifiers combines wide bandwidth and excellent DC accuracy with railtorail operation at the inputs and outputs. These devices require only 65µA per amplifier, and operate from either a single supply (2.7V to 6.5V) or dual supplies (±1.35V to ±3.25V) with a commonmode voltage range that extends beyond VEE and VCC. They are capable of driving 25Ω loads. The MAX4122/ MAX4123/MAX4126/MAX4127/MAX4129 have a 5MHz gain bandwidth product, while the decompensated MAX4124/MAX4125/MAX4128 (stable at closedlooped gains of 1 or greater) have a 25MHz gain bandwidth product. In addition, the MAX4123/MAX4125/MAX4127 feature a shutdown mode in which the outputs are in a highimpedance state and the supply current is reduced to only 25µA per amplifier. With their railtorail input commonmode range and output swing, these amplifiers are ideal for lowvoltage singlesupply operation. Although the minimum operating voltage is specified at 2.7V, the devices typically operate down to 1.8V. In addition, low offset voltage and high speed make them the ideal signalconditioning stages for precision, lowvoltage dataacquisition systems. The MAX4122 and MAX4124 come in the spacesaving 5pin SOT235 package. Selection Table PART BW (MHz) AMPS/ PKG. MAX MAX MAX MAX MAX MAX MAX MAX SHUT DOWN MODE Applications BatteryPowered Instruments Yes Yes Yes Portable Equipment DataAcquisition Systems Signal Conditioning LowPower, LowVoltage Applications PIN PACKAGE 5 SOT235 8 SO/µMAX 5 SOT235 8 SO/µMAX 8 SO/µMAX 14 SO 8 SO/µMAX 14 SO Features 5Pin SOT235 Package (MAX4122/4) 2.7V to 6.5V SingleSupply Operation RailtoRail Input CommonMode Voltage Range RailtoRail Output Voltage Swing 5MHz GainBandwidth Product (MAX4122/3/6/7/9) 25MHz GainBandwidth Product (MAX4124/5/8) 65µA Quiescent Current per Amplifier Optional Shutdown Function (MAX4123/5/7) 2µV Offset Voltage No Phase Reversal for Overdriven Inputs Drive 25Ω Loads Stable with 5pF Capacitive Loads UnityGain Stable (MAX4122/3/6/7/9) Stable at Gains 1V/V (MAX4124/5/8) Ordering Information PART MAX4122EUK MAX4123C/D MAX4123ESA 4 C to 85 C C to 7 C 4 C to 85 C 5 SOT235 Dice* 8 SO AAAZ MAX4123EUA 4 C to 85 C 8 µmax Ordering Information continued at end of data sheet. *Dice are specified at T A = 25 C, DC parameters only. Typical Operating Circuit SERIAL INTERFACE MAX187 3 SHDN V DD 1 6 DOUT AIN 2 8 SCLK VREF 4 7 CS TEMP. RANGE GND 5 PIN PACKAGE Pin Configurations appear at end of data sheet. 5V MAX4123 MARKING INFO. MAX4122 MAX4129 Maxim Integrated Products 1 For free samples & the latest literature: or phone

4 Single/Dual/Quad, WideBandwidth, LowPower, SingleSupply RailtoRail I/O Op Amps MAX4122 MAX4129 DC ELECTRICAL CHARACTERISTICS (continued) (V CC = 2.7V to 6.5V, V EE = V, V CM = V, V OUT = V CC / 2, R L tied to V CC / 2, SHDN 2V (or open), T A = 4 C to 85 C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS PowerSupply Rejection Ratio V CC = 2.7V to 6.5V 74 db OffLeakage Current SHDN <.8V, V OUT = V to V CC ±12 µa LargeSignal Voltage Gain V CC = 2.7V V OUT =.25V to 2.45V, R L = 1kΩ 84 V OUT =.4V to 2.3V, R L = 25Ω 66 V CC = 5V V OUT =.25V to 4.75V, R L = 1kΩ 86 V OUT =.4V to 4.6V, R L = 25Ω 68 db MAX4122/ MAX4123/ R L = 1kΩ V CC V OH V OL V EE 25 4 Output Voltage Swing MAX4124/ V CC V OH 3 MAX4125 R L = 25Ω V OL V EE 19 V 35 MAX4126/ CC V OH R L = 1kΩ MAX4127/ V OL V EE 5 mv MAX4128/ V CC V OH 35 MAX4129 R L = 25Ω V OL V EE 25 SHDN Logic Threshold MAX4123/MAX4125/MAX4127 Low.8 High 2. V SHDN Input Current MAX4123/MAX4125/MAX4127 ±3 µa Operating SupplyVoltage Range V Supply Current per Amplifier V CM = V OUT = V CC / 2 V CC = 2.7V 775 V CC = 5V 85 µa Shutdown Supply Current SHDN <.8V, V CC = 2.7V 5 per Amplifier MAX4123/MAX4125/MAX4127 V CC = 5V 7 µa AC ELECTRICAL CHARACTERISTICS (V CC = 2.7V to 6.5V, V EE = V, SHDN 2V (or open), T A = 25 C, unless otherwise noted.) PARAMETER GainBandwidth Product Phase Margin Gain Margin MAX4122/23/26/27/29 MAX4124/25/28 (A V 1) MAX4122/23/26/27/29 MAX4124/25/28 (A V 1) MAX4122/23/26/27/29 MAX4124/25/28 (A V 1) CONDITIONS MIN TYP MAX UNITS MHz degrees db Total Harmonic Distortion f = 1kHz, V OUT = 2Vpp, MAX4122/23/26/27/29 (A V = 1).3 % Slew Rate Settling Time to.1% TurnOn Time MAX4122/23/26/27/29 MAX4124/25/28 (A V 1) MAX4122/23/26/27/29 (A V = 1), V OUT = 2V step MAX4124/25/28 (A V 1), V OUT = 2V step V CC = V to 3V step, V OUT = V CC / V/µs µs µs 4

5 Single/Dual/Quad, WideBandwidth, LowPower, SingleSupply RailtoRail I/O Op Amps GAIN (db) GAIN (db) AC ELECTRICAL CHARACTERISTICS (continued) (V CC = 2.7V to 6.5V, V EE = V, SHDN 2V (or open), T A = 25 C, unless otherwise noted.) PARAMETER CONDITIONS SHDN Delay Input Capacitance Input Noise Voltage Density Input Noise Current Density AmpAmp Isolation Capacitive Load Stability Typical Operating Characteristics (V CC = 5V, V EE = V, V CM = V CC / 2, T A = 25 C, unless otherwise noted.) MAX4122/23/26/27/29 GAIN AND PHASE vs. FREQUENCY A V = 1 NO LOAD PHASE GAIN 4 1 1k 1k 1k 1M 1M MAX4122/291 FREQUENCY (Hz) MAX4124/25/28 GAIN AND PHASE vs. FREQUENCY A V = 1 NO LOAD PHASE GAIN MAX14122/ M V CC = 3V, V OUT = V CC / 2, MAX4123/25/ k 1k 1k 1M 1M FREQUENCY (Hz) f = 1kHz f = 1kHz MAX4126/27/28/29 MAX4122/23/26/27/29 (A V = 1) MAX4124/25/28 (A V 1) PHASE (DEGREES) GAIN (db) PHASE (DEGREES) GAIN (db) MAX4122/23/26/27/29 GAIN AND PHASE vs. FREQUENCY (WITH C LOAD) A V = 1 R L = C L = 5pF PHASE GAIN Enable Disable 4 1 1k 1k 1k 1M 1M MAX4122/292 MAX4124/25/28 GAIN AND PHASE vs. FREQUENCY (WITH C LOAD) A V = 1 R L = C L = 5 pf PHASE GAIN MAX4122/ k 1k 1k 1M 1M FREQUENCY (Hz) M M PHASE (DEGREES) PSR (db) PHASE (DEGREES) PSR (db) A V = MIN TYP MAX MAX4122/23/26/27/29 POWERSUPPLY REJECTION vs. FREQUENCY 1 1 1k 1k 1k 1M 1M FREQUENCY (Hz) A V = MAX4124/25/28 POWERSUPPLY REJECTION vs. FREQUENCY 1 1 1k 1k 1k 1M 1M FREQUENCY (Hz) UNITS µs pf nv/ Hz pa/ Hz db pf MAX4122/293 1M MAX4122/296 1M MAX4122 MAX4129 5

6 D D C AC Sweep V3 Magnitude = 1 Phase = V V U3 MAX4124 Vo V1 DC = 5 V2 DC = 5 C B B A ECE Department 55 Wabash Avenue Terre Haute, IN 4783 Ph: (812) FAX: (253) A Name: Marc E. Herniter Class: ECE 351 Size Document Name Rev A 1 <Project Name> Date: Monday, February 11, 22 Sheet 1 of 1 2 1

7 ** Profile: "SCHEMATIC1AC Sweep" [ C:\WEBSITE\ROSE_CLASSES\ECE351\EXAMS\WINTER_212\Exam 3\gain band... Date/Time run: 2/11/2 16:2:15 Temperature: (A) gain bandwidthschematic1ac Sweep.dat (active) (14.928,68.568) (9.75K,65.528) Hz 1Hz 1Hz 1.KHz 1KHz 1KHz 1.MHz db(v(vo)) Frequency Date: February 11, 22 Page 1 Time: 16:8:1

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