Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Multi-functional Packaged Antennas for Next
Document related concepts
Oscilloscope history wikipedia , lookup
Oscilloscope types wikipedia , lookup
Transistor–transistor logic wikipedia , lookup
Power MOSFET wikipedia , lookup
Audio power wikipedia , lookup
Analog-to-digital converter wikipedia , lookup
Radio transmitter design wikipedia , lookup
Surge protector wikipedia , lookup
Wilson current mirror wikipedia , lookup
Power electronics wikipedia , lookup
Negative resistance wikipedia , lookup
Integrating ADC wikipedia , lookup
Public address system wikipedia , lookup
Two-port network wikipedia , lookup
Current source wikipedia , lookup
Voltage regulator wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Current mirror wikipedia , lookup
Valve audio amplifier technical specification wikipedia , lookup
Regenerative circuit wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Schmitt trigger wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Wien bridge oscillator wikipedia , lookup
Opto-isolator wikipedia , lookup
Negative feedback wikipedia , lookup
Transcript
Practice Problems P1.17: An FM radio receiver has an input resistance of 75 Ohm. The input signal provided by a distant transmitter is 5 µV rms, and the receiver supplies 5 V rms to an 8 Ω loudspeaker. Calculate the power gain of the receiver. P1.33: An amplifier has a voltage gain of 30 dB, and a current gain of 70 dB. What is the power gain in dB? If the input resistance is 100 KΩ, what is the load resistance? P1.63: A differential amplifier has vo (t) = A1v1(t) – A2v2(t), If A1 = 1000, and A2 = 999, determine the CMRR. Answers: P1.17: 9.375 x 1E12 P1.33: GdB = 50, RL = 1 KΩ P1.63: CMRR = 60 dB Answer: -20 dB and CMRR = 114 dB 1 Chapter 2: The Operational Amplifier (Op Amp) 2 The Operational Amplifier continued Summing Point Constraint: This concept refers to the fact that under negative feedback conditions: (i) The differential input voltage will be zero in ideal op-amps (or very close to it in non-ideal ones) as the gain is ideally infinite (ii) The input current will also be zero as there is no voltage and the resistance is very high (ideally infinite) 3 The Operational Amplifier continued Note here that the resistor R2 provides the negative feedback to the input of the op-amp. This means that, as the i/p voltage increases, the negative o/p voltage also increases, and tends to reduce the input to the opamp by feedback, to provide a finite gain. 4
