The stage gains in a superheterodyne are as follows: RF amplifier 10 d mixer 6 dB, two IF amplifiers each 33 dB, detector -4 dB, AF amplifier dB. The total gain is *
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- An RF amplifier is composed of a cascade of two amplifier devices. The first has a power gain of 190W/W. The second has a power gain of 100W/W. What is the overall power gain of the cascade in dB (to two decimal places)?Since Vcc = 25 V, Vi = 36 mV, RB = 470 kΩ, RC = 3.1 kΩ, RE1 = 470 Ω, RE2 = 1.2 kΩ, RL = 56.2 kΩ and β = 110 in the circuit in the figure, find the value of the output voltage (Vo). NOTE-1: Capacitors are negligible at mid-band frequency. NOTE-2: The output impedance (r0) of the transistor will be neglected.Calculate the center frequency when the lower cutoff frequency is 20Hz and the higher cutoff frequency is 2kHz. Choices: a) 200Hz, b) 2020Hz, c) 2000Hz, and d) 44.72Hz If the midrange voltage gain of a certain amplifier is 100dB, what is the gain at cutoff frequency? Choices: a) 3dB, b) 50dB, c) 97dB, and d) 100dB
- N-channel Mosfet compared to P channel mosfetWhich of the following is true?A) It is faster.B) It has a lower input impedance.C) It has a lower noise level.D) none2. "Given a common emiiter amplifier (Fixed BIas) with the following network: RB = 900k, Rc = 1k, Beta = 150, Vcc = 12V. Determine the unloaded voltage gain." The circuit does not operate as an amplifier "22,017" 220 22 205 "2,048" "2,202"Trying to solve this MOSFET question but not sure how.(Given Answer:a) Av = -gm (ro|| RD)b)Av = -30.7 Ri = 20 kohm Ro = 7.67 kohm)
- Determine the overall noise figure for a receiver that has two RF amplifiers each with a noise figure of 6 dB and a gain of 10 dB, a mixer down-converter with a noise figure of 10 dB, and a conversion gain of -6 dB, and 40 dB of IF gain with a noise figure of 6 dB. (Ans: 6.39 dB)Design a difference amplifier shown in the following figure to meet the following criteria: vo = 2vb - 5va. The resistance seen by the signal source vb is 750 kΩ, and the resistance seen by the signal source va is 16 kΩ when the output voltage vo is zero. (Figure 1) Specify the value of Ra Specify the value of Rb Specift the value of Rc Specify the value of RdGiven: R = 5kΩ, VDS2 = 2V and VDD = 5V. Transistor M1 and M2 are almost identical. M2 has λ = 0.03 while M1 does not manifest channel length modulation. The transistors have the same dimensions, k = 4mA/V^2 and VTH,p = −0.3VDetermine:(a) Iout(b) the small signal parameters gm and ro of transistor M2.
- If the multistage amplifier is driven by a 1 μV source and the last stage is loaded with an RL = 20 kΩ, determine the expected voltage gain of the first stage. Given: R1 = 33 kΩ, R2 = 8.2 kΩ, RC = 3.3 kΩ, RE = 1 kΩ, Beta = 175Determine the noise figure for a non-ideal amplifier with the following parameters: Input S/N=80 dB; Power gain=60 dB; Input Noise=2 ? 10−18 W Internal Noise=6 ? 10−12 W1.4 A four-stage amplifier has stages with the following specifications:Stage 1: power gain = 10, noise figure = 3dB Stage 2: power gain = 15, noise figure = 6dB Stage 3: power gain = 20, noise figure = 8dB Stage 4: power gain = 25, noise figure = 10dB 1.4.1 Determine the amplifier’s gain in decibels. Solution: 1.4.2 Determine the amplifier’s noise figure.