EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy.

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Presentation transcript:

EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

Prof. R T Kennedy

TRANSCONDUCTANCE AMPLIFIER Prof. R T Kennedy SERIES F B  tr T F A tco ViVi VfVf VdVd VOVO ioio - ioio SYSTEM FEEDBACK vivi vdvd vfvf A tco  tr

TRANSCONDUCTANCE AMPLIFIER Prof. R T Kennedy + R1R1 - vivi ioio ioio + - R1R1 vovo vivi vdvd vfvf vfvf ioio ioio ioio ioio

TRANSCONDUCTANCE AMPLIFIER + R1R1 - vivi ioio ioio Prof. R T Kennedy vivi + - R1R1 vdvd vfvf vfvf ioio ioio ioio ioio ioio

TRANSCONDUCTANCE AMPLIFIER IDEAL OP-AMP ANALYSIS CLOSED LOOP GAIN Prof. R T Kennedy ioio SYSTEM FEEDBACK vivi vdvd vfvf A tco  tr -

TRANSCONDUCTANCE AMPLIFIER IDEAL OP-AMP ANALYSIS CLOSED LOOP GAIN Prof. R T Kennedy  tr vfvf R1R1 ioio ioio

TRANSCONDUCTANCE AMPLIFIER IDEAL OP-AMP ANALYSIS CLOSED LOOP INPUT IMPEDANCE Prof. R T Kennedy + - R1R1 vivi vdvd vfvf R IN r in i in ioio ioio ioio

TRANSCONDUCTANCE AMPLIFIER IDEAL OP-AMP ANALYSIS CLOSED LOOP INPUT IMPEDANCE Prof. R T Kennedy + - R1R1 vivi vdvd vfvf R IN r in i in ioio ioio ioio

TRANSCONDUCTANCE AMPLIFIER IDEAL OP-AMP ANALYSIS OUTPUT IMPEDANCE Prof. R T Kennedy vfvf v (+) v (-) vovo r out A tc0 v d r out + - i out

TRANSCONDUCTANCE AMPLIFIER IDEAL OP-AMP ANALYSIS CLOSED LOOP OUTPUT IMPEDANCE + - R1R1 vivi vdvd vfvf R OUT r out ioio ioio ioio Prof. R T Kennedy

TRANSCONDUCTANCE AMPLIFIER IDEAL OP-AMP ANALYSIS CLOSED LOOP OUTPUT IMPEDANCE Prof. R T Kennedy + - R1R1 vivi vdvd vfvf R OUT r out ioio ioio ioio

AMPLIFIER ‘PRACTICAL’ OP-AMP Prof. R T Kennedy gnd + R1R1 RFRF - vovo vivi +V -V CDCD gnd CDCD RVRV RCRC

TRANSCONDUCTANCE AMPLIFIER ‘PRACTICAL’ OP-AMP OUTPUT DC OFFSET VOLTAGE due to BIAS CURRENTS Prof. R T Kennedy + R1R1 RmRm - V i =0 v (-) =0 V o =i b(-) R m v (+) =0 i b(+ ) i b(-) i=0 v (-) =0 i b(-)

TRANSCONDUCTANCE AMPLIFIER ‘PRACTICAL’ OP-AMP OUTPUT DC OFFSET VOLTAGE due to BIAS CURRENTS COMPENSATION Prof. R T Kennedy + R1R1 - VoVo v (+) =v (-) i b(+ ) i b(-) i R1 ifif RmRm RCRC i b(+) R C v R1

TRANSCONDUCTANCE AMPLIFIER APPLICATIONS HIGH INPUT IMPEDANCE VOLTAGE –CURRENT CONVERTER  HIGH INPUT IMPEDANCE DC VOLTMETER  HIGH INPUT IMPEDANCE AC VOLTMETER  ZENER DIODE TESTER  DIODE TESTER  LED TESTER Prof. R T Kennedy

TRANSCONDUCTANCE AMPLIFIER HIGH INPUT IMPEDANCE DC VOLTMETER Prof. R T Kennedy + - ImIm R A + - V out RmRm V DC i b(-) V DC IRIR

TRANSCONDUCTANCE AMPLIFIER HIGH INPUT IMPEDANCE DC VOLTMETER Prof. R T Kennedy + - ImIm R A + - V out RmRm V DC i b(-) V DC IRIR AMMETER SCALING I FSD V DC 1 mA 1V 1 k  1 mA 5V 10 k  I FSD V DC 50  A 1V 20 k  50  A 5V 100 k 

TRANSCONDUCTANCE AMPLIFIER HIGH INPUT IMPEDANCE AC VOLTMETER Prof. R T Kennedy + - V ac ImIm ~ - V out RmRm R A + D1D1 D3D3 D4D4 D2D2

TRANSCONDUCTANCE AMPLIFIER HIGH INPUT IMPEDANCE AC VOLTMETER Prof. R T Kennedy AMMETER SCALING I FSD Vac(rms) 100  A 1V 9 k  + - V ac ImIm ~ - V out RmRm R A + D1D1 D3D3 D4D4 D2D2 I FSD V DC 100  A 1V 10 k 

TRANSCONDUCTANCE AMPLIFIER ZENER DIODE TESTER Prof. R T Kennedy + - R + - V out V DC i b(-) V DC IRIR VZVZ IZIZ

TRANSCONDUCTANCE AMPLIFIER ZENER DIODE TESTER Prof. R T Kennedy + - R + - V out V in i b(-) V DC IRIR VZVZ IZIZ RZRZ

TRANSCONDUCTANCE AMPLIFIER DIODE TESTER Prof. R T Kennedy + - R + - V out i b(-) V DC VDVD IDID IRIR IDID V (-)

TRANSCONDUCTANCE AMPLIFIER LED TESTER Prof. R T Kennedy + - R + - V out V in i b(-) V DC IRIR VDVD IDID

TRANSCONDUCTANCE AMPLIFIER TEST CURRENT > OP-AMP OUTPUT LIMIT + - R + - V out V in i b(-) V DC IRIR VDVD IDID -Vsuppply Prof. R T Kennedy

TRANSCONDUCTANCE AMPLIFIER GROUNDED LOAD current controlled by (+) input Prof. R T Kennedy + - RLRL V out VLVL i b(+) V DC ILIL R R R R VLVL VLVL IFIF I IN

TRANSCONDUCTANCE AMPLIFIER GROUNDED LOAD current controlled by (-) input Prof. R T Kennedy + - RLRL V out VLVL i b(+) V DC ILIL R R R R IFIF I IN V (-)