Transistor Buffer

Measurements PART I

(Differential Input, ~100mA Iq)

Measurements:

Rload =27 ohms
OPA2134:      THD+N:  108,0 dB (2.5V) 
                       Noise:      119,5 dB (A-weighted, 2Vref)     

NE5532:         THD+N:  106,5 dB (1V-2.5V)
(TI)                 Noise:      122,5 dB (A-weighted, 2Vref)     

OPA2211       THD+N:  113,0 dB (1V-2.5V) (~2dB below AP Generator !)
                       Noise:      125,0 dB (A-weighted, 2Vref)     
                       

AP SYS2, Unbal Float Output, Balanced IN

Opamp	Noise (2Vref)	THD+N 10mV/27Ohms	THD+N 100mV/27Ohms	THD+N 1V/27Ohms	THD+N 2V/27Ohms	THD+N 3V/27Ohms
NE5532	122,5 dB	68 dB / 0.04 %	87,5 dB / 0.0042 %	106  dB / 0.0005 %	106 dB / 0.0005 %	105 dB / 0.00056 %
OPA2134	119,5 dB	65 dB / 0.056 %	86 dB /  0.005 %	105 dB / 0.00056 %	107,5 dB / 0.00042 %	105 dB / 0.00056 %
OPA2211	125,0 dB	71 dB / 0.028 %	92 dB /  0.0025 %	110 dB / 0.00032 %	113 dB / 0.00022 %	112,5 dB / 0.00023 %
AP-SYS2	> 140 dB	?	102 dB / 0.00079 %	114 dB / 0.0002 %	115 dB / 0.00018 %	115 dB / 0.00018 %

Link to OPA134
Link to NE5532
Link to OPA2211
Link to AP-SYS2

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OPA 2134, Rl = 27 Ohms, differential IN


OPA 2134, Rl = 27 Ohms, differential IN, ZOOMED



OPA 2134, Rl = 27 Ohms, differential IN,THD




OPA 2134, Rl = 27 Ohms, differential IN,Noise Vref=2Vrms, A-weighted




OPA 2134, Rl = 27 Ohms, THD vs Frequency, Vout=1Vrms, BW=80kHz

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NE5532, Rl = 27 Ohms, differential IN



NE5532, Rl = 27 Ohms, differential IN, Zoomed



NE5532, Rl = 27 Ohms, differential IN, THD




NE5532, Rl = 27 Ohms, differential IN,Noise Vref=2Vrms, A-weighted

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OPA2211, Rl = 27 Ohms, differential IN



OPA2211, Rl = 27 Ohms, differential IN, Zoomed


OPA2211, Rl = 27 Ohms, differential IN, THD




OPA2211, Rl = 27 Ohms, differential IN,Noise Vref=2Vrms, A-weighted

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AP SYS2


AP SYS2, FFT Generator 1V, after Notch