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577.

The logic function implemented by the following circuit at the terminal OUT is

[2 marks]
(A) P NOR Q
(B) P NAND Q
(C) P OR Q
(D) P AND Q

last reply by CpjJwWHV • 14 years ago • asked in Electronics and Communication Engineering, 2008

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578.

Consider the Schmidt trigger circuit shown below.

A triangular wave which goes from -12V to 12V is applied to the inverting input of the OPAMP. Assume that the output of the OPAMP sings from +15V to -15V. The voltage at the non-inverting input switches between
[2 marks]
(A) -12V and +12V
(B) -7.5V and +7.5V
(C) -5V and +5V
(D) 0V and 5V

asked in Electronics and Communication Engineering, 2008

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579.

The cross section of a JFET is shown in the following figure. Let V_a be -2V and let V_p be the initial pinch-off voltage. If the width W is doubled (with other geometrical parameters and doping levels remaining the same), then the ratio between the mutual transconductances of the initial and the modified JFET is

[2 marks]

asked in Electronics and Communication Engineering, 2008

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580.

Silicon is doped with boron to a concentration of 4×10¹⁷ atoms/cm³. Assuming the intrinsic carrier concentration of silicon to be 1.5×10¹⁰/cm³ and the value of kT/q to be 25mV at 300K.
Compared to undoped silicon, the Fermi level of doped silicon [2 marks]
(A) Goes down by 0.13eV
(B) Goes up by 0.13eV
(C) Goes down by 0.427eV
(D) Goes up by 0.427eV

asked in Electronics and Communication Engineering, 2008

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581.

An astable multivibrator circuit using IC 555 timer is shown below. Assume that the circuit is oscillating steadily

The voltage V_C across the capacitor varies between [2 marks]
(A) 3V to 5V
(B) 3V to 6V
(C) 3.6V to 6V
(D) 3.6V to 5V

asked in Electronics and Communication Engineering, 2008

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582.

An 8085 executes the following instructions
2710 LXI H, 30A0H
2713 DAD H
2714 PCHL
All addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL. Which of the following statements is correct?
[2 marks]
(A) PC = 2715H, HL = 30A0H
(B) PC = 30A0H, HL = 2715H
(C) PC = 6140H, HL = 6140H
(D) PC = 6140H, HL = 2715H

asked in Electronics and Communication Engineering, 2008

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