4) phase-modulation circuit 调相电路5) digital circuit 数字电路 1. Analysis of digital circuit s simulation based on Protel 99SE; 基于Protel 99SE的数字电路仿真分析 2. Fault diagnosis using IDDT for digital circuit based on wavelet analysis; 基于小波分析的数字电路动态电流测试技术 更多例句>> ...
The vector synthesis phase modulator realizes phase modulation by controlling the amplitude of two orthogonal signals output by the coupler. The phase modulation angle is large, but the circuit structure is very complex. The latter is mainly to embed tunable electronic components (MEMS, reactance ...
Circuit Diagram Instead of converting bits into a digital stream, QPSK converts it into bit pairs. This method is also known as theDouble Side Band Suppressed Carrier modulationmethod. QPSK modulation circuit consists of a bit-splitter, 2-bit serial to parallel converter, two multipliers, alocal...
Method for constructing multimode quadrature amplitude modulation (QAM) uniform constellation diagram label and modulator 本发明公开一种多模式QAM统一星座图标签的构建方法及调制器,多模式QAM统一星座图标签构建了一种包括多种22nQAM(n为自然数,n≥1)正方形星座图的统一标签,将统一标签生... 赵利,王国正,莫金...
这个跟起振频率内部进行 cross modulation的结果波形变形。 选择频率中意味这频率集中性的指标 Q值也会对 phase noise起到重要的作用。 phase noise会弄乱频带,特别是各种调制、解调时带来影响。 2. Semiconductor-Thermal-Noise & Phase-Noise 的关系 semiconductor-thermal-noise 有 3种 noise。 1) 低频部分的 flic...
the charge pump must replace the bias current drawn by the op amp inputs on each PFD cycle. This modulates the VTUNEvoltage at the PFD frequency and causes spurs around the carrier at an offset equal to the PFD frequency. The higher the input bias current, the greater the modulation of ...
A three phase five-level NPC inverter circuit diagram is shown in Fig. 5. Each of the PWM modulation and operating principle PWM strategies used in a conventional inverter can be modified in multilevel inverters. Different PWM techniques are applied for controlling the active devices in a multi...
Modulation control input 14 is coupled through operational amplifier 18 to Raysistor 20. The unmodulated signal, i.e., the carrier signal is coupled through Schmitt trigger 26, and the modulated signal is coupled through Schmitt trigger 28, to phase detector 24. The output of phase detector ...
7532/52. Class 40 (5) A carrier wave of medium frequency, which may be stabilized by a crystal, is phase modulated by mixing the carrier with a wave of much higher frequency to produce one or both side frequencies, applying the modulation to vary the phase of one or both side ...
A non-invasive ultrasonic flowmeter which utilizes the phase modulation of an ultrasonic beam transmitted through a fluid carrying conduit to determine the fluid volumetric flow rate. Transmitting and