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A particular differential amplifier operates from an emitter current source I = 0.4 mA. Each of the collector resistances RC = 20 kO.
As a cascade of a common-collector stage Q1: and a common-base stage Q2: Assume that the BJTs are matched and have a current gain.
Find the value of RD that results in a differential gain Ad of 8 V/V. Determine the dc voltage at the drains.
Find the percentage change required in one of the two drain resistors so as to reduce Acm to zero .
The only source of mismatch in the circuit is a 2% difference between the W/L ratios of the two transistors.
If for the specific technology utilized V1A = 5 V/µm, specify the channel length L of the cascade transistor.
For vB1 =vB2 =vicm, where vicm has a zero average, find the magnitude of the common-mode gain, / vo/vicm /.
Find the differential gain, the differential input resistance, the common-mode gain assuming the resistances RC have 1%.
Consider the basic differential circuit in which the transistors have ß = 100 and VA =100 V, with I = 0.2 mA, REE =500 kO, and RC =25 kO.
In a bipolar differential-amplifier circuit, the bias current generator consists of a simple common-emitter transistor operating at 200 µA.
The common-mode gain and the CMRR if the bias current I is generated using a simple current mirror.
To determine the required bias current I, derive an expression for the total voltage at each of the collectors in terms of VCC and I in the presence.
An npn differential amplifier with I = 0.4 mA, VCC = VEE = 2.5 V, and RC = 5 kO utilizes BJTs with ß = 100 and vBE = 0.7 V at iC = 1 mA.
An npn differential pair employs transistors for which vBE =690mVat iC =1 mA, and ß =50. The transistors leave the active mode at vCE 0.3 V.
Find the ripple component of the collector voltages, vC1 and vC2, as well as of the difference output voltage vod = vC2 -vC1.
Provide a tabulation of the ratio (?iE1/I ) /vid , which represents the proportional transconductance gain of the differential pair, versus vid .
For a differential input signal of zero volts, what do the collector currents become?
A BJT differential amplifier is biased from a 0.5-mA constant-current source and includes a 400-O resistor in each emitter.
Design a BJT differential amplifier to amplify a differential input signal of 0.1 V and provide a differential output signal of 2 V.
Explore the trade-off between input common-mode range and differential gain in the design of the bipolar BJT.
What is the largest possible input common-mode voltage for which operation is as required? Assume a ? 1.
With no emitter resistances Re, use the large-signal model to find iC1 and iC2 when vid = 20 mV.
What is the maximum allowable value of the input common-mode voltage, VCM? Recall that to maintain an npn BJT in saturation.
Sketch the circuit and give its differential half-circuit. If VA =20 Vfor all transistors, find the differential voltage gain achieved.
Operate all transistors at VOV = 0.15 V and assume that for the process technology in which the circuit is fabricated, Vtn = 0.4 V and µnCox = 400 µA/V2.