Hf power amplifier (power amplifier) hf power amplifier (hf power amplifier) characteristics of hf power amplifier (hf) hf power amplifier (c) cf amplifier c cf amplifier c cf amplifier c cf amplifier bb cf amplifier circuit composition bhf power amplifier hf power amplifier (hhf power amplifier) hf power amplifier 3. Hf power amplifier hf power amplifier (hf power) power transferer c cf (cfmf) the integration effect of amplifiers is an indicator of the performance of this conversion: as amplifiers, power gain is an important performance indicator, but it is second place. Ii. The performance characteristics of power tubes are in the process of operation, which tends to select different static work points so that they are applied to different segments of the activity to achieve different application states such as a, b, c and d. With the input cosine incentive, the wave shape of the cet output ic is different: demo: the hf amplifiers work differently, and the corresponding maximum ced efficiency varies. Assuming that the tube collects the electrode current is ic and the voltage is vce, the c is the most efficient. The smaller the ic lead time, the lower the pc. (a) demonstration: u power amplifier a, b, c-spectrometers + ub - uc - ic + uc - uc1 - ub ec + us - ub + ub - ub + +c1 - ub = ub ubic? Ugc + ub vbe ic? - ubbb + + + + + + ub + + + & b - u ic ic ic θ θ θ θ θ θ θ θ θ θ θ + θ θ θ + ic ic ic ic ic + + + + + + + + + + + - ub + + ic ic + - ic - θ θ - θ θ θ θ - θ - θ θ θ θ θ - θ θ θ θ bm v transistor high-frequency power amplifiers, power voltage utilization factor output power. Power supply from power, peaks and conductors. If the pressure is offset, enter the amplitude required for the signal. An ic + uce - uc2 + ic1 ic2 ic1 ic2 ic3 ic4 lc1 ic1 ic2 ic2 ic2 + ub - l ec-ub + uc1 - ic rp + uce - ube dynamic line: based on vbe and vce values, find the corresponding dynamic point and the resulting ic values and draw the ic wave shape on the output properties curve =f (vce) with the vbe reference variable. Of these, the dynamic point's connection is referred to as the dynamic line of the resonance power amplifier. Point a: point c: point b: uce ic ? A o ec ? Q ucm ucmin ubemax demo: approximation analysis method for the resonance power amplifier line ab, bc dynamic characteristics curve when point a2 is in a critical area called critical, point a1 is in a state of amplification known as underpressure (undervoltage) when point a1 is in a state of amplification, and point a3 is in a state known as overvoltage (overvoltage) when the power amplifier is in a state of three working and state shapes, the dynamic properties curve is tilted using a, two points straight lines: 1. A1 is in a low-pressure zone, ic is a cosin, and the pulse is slightly reduced with the increase of vcm. 2. A2 criticality. 3. A3 in the pressurized zone, i. E., the pulsation wave of the mid-deep, is reduced in height as the diagnosing of the vcm is deepened. When vbe increases to vbemax and vce decreases to vcemin, the corresponding dynamic point reaches the critical point (point e in the figure) with the highest value for ic and then enters the saturation zone, with a reduced value for ic and a dim. Until point a3, the value of ic is minimal. Why do you have a dimple in the stress zone? The kinetic properties of a tuning power amplifier are shown in the figure, and the following options are answered and calculated: (1) what is the status of the operation at this time? Write a, b, c three points coordinates, draw the ic wave shape. (2) calculated and calculated. Case (1) a, b, c three-point coordinates: abc motion characteristic: a motion characterization coincides with a critical saturation line and therefore works in critical state with the wave shape of ic as follows. Six, the c power amplifier principle and working state*
