I show that R$C - " Cfcloak Reg cfclock Req 2) Design/Modify Voltage control oscillator and frequency oscillator Using colpitts oscillator 3) Explain what is Sampling theorem
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- a) i. Draw the Colpitts oscillator and explain how it works. ii. State the functions of all the components of the Colpitts oscillator. iii. From your drawing, state the formulas to find the feedback fraction, minimum gainto sustain oscillations and emitter resistor.A 555 timer configured to run as an astable mode oscillator is shown in Figure 1. If the output is needed to have 30% duty cycle, i) Determine the required value of Rị if R2 = 7kN. ii) Determine the frequency of the output. iii) Draw the charging and discharging phase of capacitor Cext and its relation with the output waveform. ASsume Vcc = 12 V. +Vcc (4) |(8) R1 RESET Vcc (7) DISCH 555 D1 R2 (6) THRESH (3) OUT (2) TRIG (5) CONT GND :Cext 0.01 µF (1) 0.01µF Figure 1Explain wein bridge oscillator in detail. give its advantages and disadvantages in detail
- 2. a) Design a 9v DC oscillator circuit that produces a frequency of 500 Hz. The circuit may use a 555 timer or two transistor design(s). Show all calculations including the DC currents and bias voltages. Include the schematic and the required frequency formula(s). b) As a bonus, if a larger load were required to be connected to the chip, how would the schematic look and what components would be used to do design it? Also, as a theoretical approximation, if the 9v battery had a rating of 4 amp-hours, how long would it last powering this circuit? Show calculations to illustrate how you arrived at the answer.The 6 bit DAC has a 101101 INPUT and a 10 volt reference voltage. a. Determine the output voltage b. Determine the resolution of the DACA/D CONVERTER( NEED NEAT EXPLANATION HANDWRITTEN SOLUTION ONLY PLEASE OTHERWISE DOWNVOTE).
- hese blockS. c) Explain the difference between the modulator and demodulator blocks and explain the terms up-conversion and down-conversion.. What is the largest value of output voltage from an 8-bit DAC that produces 1.0V for a digital input of 00110010?4- What is the effect of adding capacitor in parallel to the load at the rectifier output? Note: Please do not handwritten.
- 4. Signal conditioning element basically takes the output of the sensing element and converts it into a form more suitable for further processing, usually in the form of a DC voltage, DC current or variable frequency AC voltage. The output of the sensing element is usually too small to operate an indicator or a recorder. Therefore, it is suitably processed and modified in the signal conditioning element so as to obtain the output in the desired form that is amplify the signal and filtering the unwanted signal. i. Describe the aliasing phenomenon. ii. Suggest a solution to minimize the effect of aliasing.The shown sampled signal is the output of the ADC of Arduino Uno, calculate: 1- The number of samples (N) that needs to calculate Ts. 2- The normalized values for the shown max and min (normalized to 5 V). 3- The signal frequency if the sampling time of Arduino ADC is: Ts=112usec. 1020 35Please include details