Synapse Design Analog Design Engineer Interview Questions and Answers

Analog circuits , opamp, mosfets , Rc circuits

Q1. Nmos design and working
Ans. 
NMOS (N-channel Metal-Oxide-Semiconductor) is a type of MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) that uses n-type semiconductor for the channel.
• NMOS transistors are used in digital and analog circuits for switching and amplification.

• In NMOS design, the gate is made of metal, the insulator is made of oxide, and the semiconductor is n-type.

• NMOS transistors operate by applying a voltage to the gate termi...read more
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Q2. CMOS circuit and design along with VTC characteristics
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CMOS circuits are widely used in integrated circuits for their low power consumption and high noise immunity. VTC characteristics show the relationship between input and output voltage.
• CMOS circuits consist of complementary pairs of p-type and n-type MOSFETs, allowing for low power consumption and high noise immunity.

• VTC (Voltage Transfer Characteristic) shows the relationship between input and output voltage in a CMOS...read more
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Asked about Network theory

Q1. Asked about electrical questions
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Q2. Does not remember
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Basic questions of aptitude

Q1. Basic questions of circuit theory and analog
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Q2. Bode plot questions
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Q3. Rc network with constant current source
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An RC network with a constant current source is used to create a voltage output that is proportional to the input current.
• RC network consists of a resistor (R) and a capacitor (C) connected in series or parallel.

• Constant current source ensures a steady current flows through the network.

• The voltage output across the RC network is determined by the time constant (RC) and the input current.

• This configuration is commonly u
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Contained analog basics

Q1. Cmos , Nmos characteristics in depth along with output and input wave forms, some basic digital questions , questions on current mirrors .
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90 minutes with 20 questions of Analog and Aptitude each. Topics are Basic Network Theory, Diode, Op-amps, etc. Topics may vary place-to-place.

Q1. Questions are cumulative: Draw a Lowpass filter (RC)
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Q2. Add capacitor parallel to one resistor and tell frequency response
Ans. 
Adding a capacitor in parallel to a resistor changes the frequency response of the circuit.
• The cutoff frequency of the circuit decreases as the capacitance increases.

• The circuit becomes a high-pass filter with a -20dB/decade slope above the cutoff frequency.

• The impedance of the capacitor decreases as frequency increases, allowing more current to flow through the circuit.

• The resistor and capacitor form a voltage divider...read more
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Q3. Add resistor to the capacitor and tell frequency response
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Adding a resistor to a capacitor changes the frequency response of the circuit.
• The cutoff frequency of the circuit decreases with increasing resistance.

• The circuit becomes more attenuative at higher frequencies.

• The time constant of the circuit increases with increasing resistance.

• The circuit becomes more stable and less prone to oscillation.

• Example: A low-pass filter with a 10uF capacitor and a 1kohm resistor has a cut
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Q4. T-flip flop mod3 counters and reset
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Q5. A tricky diode based network question with both cases(ideal and non-ideal diode)
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Q6. Aptitude question of 1000 bottles and one poisoned
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