在线网课学习课堂《模拟集成电路分析与设计（电子科大 ）》单元测试考核答案

注：不含主观题
第1题
单选题
(1分) For a npn BJT, conditions for working in forward active region:_______ A VBE>0, VBC>0B VBE>0, VBC<0C VBE<0, VBC>0D VBE<0, VBC<0
第2题
单选题
(1分) For a NMOS, its mathematical model for working in the triode region:_______ A ID=un*Cox*W/L*[(VGS-VTH)VDS-VDS^2]B ID=un*Cox*W/L*[(VGS-VTH)VDS-1/2VDS^2]C ID=1/2*un*Cox*W/L*[(VGS-VTH)VDS-1/2VDS^2]D ID=1/2*un*Cox*W/L*[2*(VGS-VTH)VDS-1/2VDS^2]
第3题
多选题
(2分) For output characteristic, choose the correct answer:
For BJT, when work in forward active region,  Ic ( ).
For MOSFET, when work in saturation region,  ID ( ). A ;B ;C ;D .
第4题
多选题
(2分) Comparison between MOSFET and BJT, choose the main applications for:
MOSFET: _______  A high frequency;B low power;C low noise;D VLSI circuits
第二章作业
第1题
填空题
(4分) For an ideal amplifier, AV = ____，Rin =____，Ro =____，CMRR = ____A. +∞  B. 0
第2题
多选题
(2分) One single transistor can be used as  ( ) A Amplifier;B source follower;C cascade;D current mirror.
第3题
单选题
(1分) For a BJT single transistor amplifiers, the input resistance is ______and output resistance______. A common emitter<common base<common collector;common emitter<common collector<common base;B common base<common emitter<common collector;common collector<common emitter=common base;C common base<common emitter<common collector;common emitter<common collector=common base;D common base<common collector<common emitter;common collector<common emitter<common base;
第4题
多选题
(2分)  Using the miller effect, capacitance C can be equivalent to C1 and C2C1 =
,  C2 =
A C ( 1 + A )B C ( 1 +  )C C ( 1 – A )D C ( 1 -)
第5题
判断题
(1分) Source follower mainly acts as a current buffer  ()
第三章作业
第1题
单选题
(1分) .Please choose the most significant difference between Wilson current mirror and cascode current mirror? ()
A Output voltage swingB Frequency responseC Output resistanceD Accuracy
第2题
单选题
(1分) What’s the advantage of a basic differential amplifier with mosfet input over bipolar input for same resistive load? ()
A Higher gain;B Lower equivalent current
noise;C Lower equivalent voltage noise;D Wider differential input
range.
第3题
单选题
(1分) What’s the equivalent input resistance of this cross-coupled structure? ()
A 2/gm2;B 2/gm1;C 2/(gm1-gm2);D 2/(gm2-gm1)
第4题
单选题
(1分) For an ideal current source, what kind of characteristic is desirable? ()
A Zero input resistance, zero output resistanceB Zero input resistance, infinite output resistanceC Infinite input resistance, zero output resistanceD Infinite input resistance, zero output resistance
第四章作业
第1题
多选题
(2分) Please choose the unit of Power Spectrum Density  (PSD)  (). A VB V^2C V/HzD V^2/Hz
第2题
单选题
(1分) How to reduce a resistance thermal voltage noise PSD in a low-pass network? ()
A Work in low temperatureB Work in high temperatureC Increase filter capacitancesD Decrease filter capacitances
第3题
单选题
(1分) How to reduce a resistance thermal voltage noise PSD in a low-pass network? ()
A Increase resistanceB Decrease resistancesC Increase filter capacitancesD Decrease filter capacitances
第4题
单选题
(1分) Assuming the bandwidth of a low-pass system is , how much is its noise bandwidth? ()  AB BWC D
第五章作业
第1题
单选题
(1分) For a two negative pole operational amplifier, the non-dominant pole is about 3 times the GBW. In this case, the phase margin is close to ()
A 45°;B 50°;C 70°;D 90°
第2题
单选题
(1分) For a three-stage opamp, the non-dominant pole and third pole is better set at ()
A 2GBW,3GBW;B 3GBW,4GBW;C 2GB2,5GBW;D 3GBW,5GBW
第3题
单选题
(1分) If an operational amplifier is a single positive zero amplifier, the gain slope is ____ and its phase of _____ is constant for all frequencies beyond the zero. A +20dB/dec, -90°B -20dB/dec, -90°C +20dB/dec, +90°D -20dB/dec, +90°
第4题
单选题
(1分) If an operational amplifier is a single negative pole amplifier, the slope of _____ is maintained to frequencies beyond its GBW and its phase of _____ is constant for all frequencies beyond the pole. A -20dB/dec, +90°B +20dB/dec, -90°C -20dB/dec, -90°D +20dB/dec, +90°
第六章作业
第1题
单选题
(1分)
For the OTA shown in figure 063, its
Common-mode input voltage range will ()
as the W/L of both M1
and M2
increases.
A Increase;B decrease;C keep
constant.
第2题
单选题
(1分)
For the OTA shown in figure 063, the
SR for CL
will ()
as the W/L of both M1
and M2
increases.
A IncreaseB decreaseC keep
constant
第3题
判断题
(1分)
For the OTA shown in figure 063, in
order to reduce the input offset voltage, the transconductance ()
of M3 and M4 should be decreased. ()
第4题
判断题
(1分)
For the OTA shown in figure 0611,
the minimum input voltage can be lower than VSS.
()
第5题
判断题
(1分)
The SR of the OTA shown in figure
0636 is not related with CL.
()
第七章作业
第1题
单选题
(1分)
Compared to simple CMOS OTA, telescopic OTA shows () gain.
A larger;B smaller;C same;D can’t decided.
第2题
单选题
(1分)
What’s the location of dominant pole of folded cascode OTA?()
A input node;B drain of input pair;C output;D current mirror
第3题
单选题
(1分)
Folded cascode OTA is widely used in analog circuit design. Actually it’s () stage amplifier and easily to be compensated.
A one ;B two;C three;D Four
第4题
判断题
(1分) r symmetrical OTA, the GBW can be always improved by increasing  current factor（）
第八章作业
第1题
单选题
(1分)
The GBW of amplifier in CMFB circuit should be () than differential amplifier.
A larger;B smaller;C same;D can’t decided;
第2题
单选题
(1分)
When a linear MOSFETs is used as CMFB, the operation region of MOSFETs are ().
A saturation regionB linear regionC cutoff regionD reverse
saturation region
第3题
判断题
(1分)
Compared to single end CMOS OTA, the full differential amplifier needs CMFB circuit. ()
第4题
判断题
(1分)
The differential input range of CMFB amplifier will limit output swing of differential amplifier. ()
第九章作业
第1题
单选题
(1分) In basic 3-stage amplifier, according to the transfer function of open loop, if all the poles are real, p,q should be () to make sure phase margin is 60.
A 2,4;B 3,5;C 1,3;D 5,6
第2题
单选题
(1分) In a multi-pole system, there are complex poles in the open loop, then in the closed loop there ()
A must be complex poles;B should be no complex poles;C may be complex poles;D should be all real poles
第3题
单选题
(1分) In NMC 3-stage amplifier, there are ()
A 3 poles, no zeros;B 3 poles, 1 zero;C 2 poles, 1 zero;D 3
poles, 2 zeros
第4题
单选题
(1分)  In 3-stage nested miller [NMC] CMOS OTA, the number of poles in open loop are A 1B 2C 3D 4
第十章作业
第1题
单选题
(1分) In the multiplying 3 current mirror, when the NMOS differential is off, the working current of the PMOS differential is ().
A IB;B 2IB;C 3IB;D 4IB
第2题
单选题
(1分) In a weak inversion op amp design, the relationship between gm and IDS is ().
A square relationship;B exponential relationship;C linear relationship;D square root relationship
第3题
单选题
(1分) In the zenor diode op, the W/L of the electronic zenor is usually designed as ().
A arbitrary design;B same as differential pair;C 3 times than differential pair;D 6 times differential pair
第4题
单选题
(1分) When Vdd is lower than 1V, the technique for the rail to tail op is ().
A increase the biased current of differential pairB decrease the biased current of differential pairC to level shift the voltage of input signalD to amplify the input signal
第十一章作业
第1题
单选题
(1分) Shunt-shunt feedback can( )output resistance, ( )input resistance ().
A increase, decreaseB increase, increaseC decrease, decreaseD decrease, increase
第2题
单选题
(1分) Series-series feedback is realized by sampling the( )of output and superimposing the( )of input ().
A voltage, currentB voltage, voltageC current, currentD current, voltage
第3题
单选题
(1分) The feedback type is () in CMOS inventor with resistor feedback shown in Fig.1. A shunt-shuntB shunt-seriesC series-seriesD series-shunt
第4题
填空题
(1分) If the open loop gain of the system is 90dB and loop gain is 20dB, the close loop gain of this system is____dB.
第十二章作业
第1题
单选题
(1分) The forward voltage of the PN junction diode has a ( ) temperature coefficient, and the threshold voltage of the enhancement mode MOSFET has a ( ) temperature coefficient ( ). A positive, negativeB positive, positiveC negative, negativeD negative, positive

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