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1、模拟乘法器应用及调幅电路（Analog multiplier applications and am circuits）Experiment six analog multiplier applications and am circuitsOne purpose of the experiment 1, grasp the principle and properties of AM, increase DSB and SSB modulation2, master analog multiplier (MC1496) working principle and adjustment met
2、hods of La3, the research has shown the relationship between wave and modulation signal and carrier signal4, grasp the principle is observed using transistor collector for amplitude modulationTwo, experimental instrument 1, a note the analog oscilloscope2, a regulated power supply3, spectrum analyze
3、r one4. High frequency voltmeter5, multimeter6 、 high frequency function signal generator7, pay attention to the low frequency signal source a8, the experiment board sine, power amplifier, amplitude modulation three block three, the experimental principle and the related knowledge is from modulation
4、 signal to be transmitted to the high frequency signal on load. The loading process is actually utilizationThe control signal of a high-frequency oscillation signal amplitude, frequency and phase parameters of the exergy make the parameters with the signal changes of the exergyModulation process.Mod
5、ulation modes include continuous wave modulation and pulse wave modulation. The modulation of analog continuous signals is actually continuous wave modulation.If the modulation process exergy send signals to control the high-frequency oscillation signal the carrier amplitude, frequency or phase. We
6、respectivelyThey are called amplitude modulation, frequency modulation, and phase modulation.The time domain of the carrier amplitude modulated wave energy changes with the change of the modulation signal. The frequency domain and frequency conversion of exergy exergyThe signal spectrum structure is
7、 invariant exergy signal spectrum without distortion in the frequency axis linear movement.The amplitude spectrum before and after mixing the exergy exergy detector as shown in Figure 6-1 from o.Omega 1 2 4 3mutuallyYesVibrationAmplitude carrier frequencyOmega Omega 0-Omega 3 Omega 0+Omega 3 Omega 0
8、+Omega 4 Omega o Omega 0 -Omega 4 Omega 0- 2 Omega 0+Omega 1 Omega 0- 1Omega 0+Omega 2 (a) amplitude spectrum before and after amplitude modulationOmega i+Omega 4 Omega I Omega I - Omega 4 OmegaOmega s+ Omega 4 Omega s Omega s - Omega 4 Omega 0 local oscillatorIntermediate frequencyThe spectrum of O
9、mega i= Omega 0 - Omega s (b) mixing before and after1 Omega OmegaOmega i+ Omega 4 Omega I Omega I -A spectrum of front and rear detectors of Omega 4, 1, 2, 3, 4Fig. 6-1 frequency spectrum diagram of frequency shifting circuit 1 and amplitude modulation principleAccording to the extracted exergy of
10、modulated signals with different frequency modulation of the exergy is divided into ordinary AM, an exergy suppressed carrier double sideband suppressed carrier, the DSB single sideband amplitude modulation amplitude modulation in the SSB process. The main difference between them is the method of pr
11、oduction and the spectrum structure. Pay attention to compare their respective characteristics and their applications. Amplitude modulated amplitude modulation of single sideband double sideband amplitude modulation with suppressed amplitude modulated waveVoltageExpression tCOS) tcosm1 (V0a0, Omega,
12、 +tcostcosVm00a, Omega, t) cos (V)TwoM0ZeroA.(omega) t) cos (V)TwoM(00A.W + orWaveformFrequency spectrum Omega 0-OmegaOmega 0 Omega 0+OmegaV0mm0aVmTwoOneOmega 0 0-Omega Omega+Omega M0aVmTwo1 Omega 0 0- Omega + Omega M0aVmTwo1 signal bandwidthTwo(2 g omega)Two(2 pi, pion 2Table 6-1 characteristics an
13、d comparison of various amplitude modulated wavesIf you have to tune wave load resistance R and exergy carrier side frequency will give power transmission of their exergy resistanceAre those carrier power from RVPoOTTwenty-twoOne= (6-1) each side frequency power the upper frequency or lower frequenc
14、y fromOTAOASBSBPmRVmPP2TwoTwo hundred and fourteenOneTwoOneTwoOne=?= (6-2)2, the total power of the lower frequency oTaSSBDSBPmPP22One2= (6-3)Called amplitude modulation index in amplitude modulation is one of the main parameters of amplitude modulation wave in which voltage amplitude modulated carrier saidThe degree of change in control signal after am10 or am.2 、 amplitude modulation method and circuitThe schematic diagram of the amplitude modulation circuit is shown in Figure 6-2 (a) (b) (c), respectively. beltthroughV AM (T)Omega ov (T)V0 (T) V omega (T)VDSB (T)VO (T) (a) ordinary ampl
