Capacitation factor, when used to the fullest extent, a: working state of type b: working state of type c: establishment of example vcc = 24 v, po = 5 w, = 70 o, = 0. 9 ?, = = 0. 9 ? C, p = 1 , pc, icmax and circuit resonance resistance to rp resolution: 0. 1 0. 2 0. 3 0. 4 0. 5 0. 0 60 80 100 120 140 180?(?) = 5 = 5 = 5 = 5 = 5 = ? ?) = 0 ?) = 1 g1 (?) - bb + l + + vs + + vs + + vb + + vc + + + + & v + & v + + + + high frequency * 5 * & 5 * & 5 * & 5 * * * & 5 * & * & * * & & * * & * & & * electricity gain: electricity gain: β +1? Basic magnification circuit for three groups cen cc cb 1. Main characteristics of power magnification circuit output power? Abq power triangle (1) allows a slight non-linear wave shape distortion. If you want po big, make vom big and iom big. 1. The main characteristic of power magnification circuits is non-linear (large signal) (2) the tube works near the limit. 2. The problem to be addressed reduces the distortion (linearity) protection of tubes increases output power increases efficiency 3. Ways to increase efficiency reduces static power consumption, i. E., reduces static currents. Vi = 0 vi = v0sinωt (a) class-a mplifier (b) class-b mplifier (c) class-accord (d) class-c class 4. C pass-c pliffier 4. 5. Resolution of the conflict between efficiency and distortion < low high 3 nω 2 nω 05 > > efficiency and distortion > > . Active device resonance loop narrowband amplifier c recovers the full-cycle signal from the c cosine chord pulse by tuning load. 3 2 1 5 4 tr 1 c l yl t input circuits output loop back transistors 6. Comparison of resonance (hf) and non-resonance (low frequency) power: requiring high output power, high efficiency, non-linear (large signal) different: low frequency (audio): 20 hz ~ 20 khz hf (radio frequency): (for example), low high hgh ω am broadcasting signal: 535 khz ~ 1605 khz, bw = 10khz vibration and non-resilient (working state) working frequency different from relative bandwidth, 7. Subdued relationship in all aspects of power release design reduce the loss of truth (wireness) tube protection (for example) enhanced output power (1) c-transforming 180o, when best? Legacy issues: (2) enrichment, criticality, saturation, where are the best? Function: conversion of direct current power to communication signal power. Main indicator: output power and efficiency state of operation: non-linear state (non-linear distortion) of large signal type c the difference between the v bm v be w t signal amplifier and the c-colyst amplifier is that the working state is, respectively, small signal class a and large signal class c. As a result, negative power sources were used as a basis bias. W t c0 - q c + c vbb 0 - q c + c v be transferred properties i c v bz o idea 5. 2. 1 basic circuits for high frequency power amplifiers 1. Ic of non-linear working transistor collections are associated with static work point and input signal size (a) static work point is in the magnification area (b) t w or volt currents 0 v bz v - bb v bm v v bm v b e x i c c c (0, 0 c c c c v c c v c v c c v c v c v c v c v c v c v c v c v c iv v cm 1. I i i i i i i c c ) is in the same position as v be and input signal size (a) static work point is in the magnification area (b) v c iv c iv v - bb b b b b bm v v v v v v v v v v v v v v ng & v v v v i c + c + c + c = c + + it would be useful to have a clear mathematical expression to show the relationship between the two and antagonal gillc in order to give direction to the selection of the amplifier working state when the circuit is designed and debugged. In view of the fact that the conjunctive power amplifiers work in type c (non-linear, large signal), the method of contortion is to reconcile the method of pyrolysis with that of mathematical resolution: the contour method of approximation. Figure 5. 3. 1 output properties of transistor tubes and their idealization ic = gcrvce unpressure threshold 5. 3. 2 transistor static transfer properties and their idealization ic = gc (vbe-vbz) (vbe > vbz) v bm v be wt t i c 0 - q c + c vbb o - q c + c v be transfer properties i c v bz 0 idealizes the simplified analysis model of transistor tubes and solves the frequency fractions of electrode cosine pulsing currents. First, write its expression. Ic = gc (vbe-vbz) (vbe > vbz) = gc (vbmcosωt-vbz-vbbb) = gcvbm (cosωt-cos? C) = gcvbm (1-cos ? C) when? T=0, ic = ic max depends on ic max and contangular angles? C when ? T= ? C ? Ic = 0 by 傅t θc θc ic1 ic2 ic3 icicmax map 5. 3. 3 in which the stuture cosmbrase is analysed below the spectrobeam coefficient of ic1 and ? C and output power of po to select the appropriate working state. The decomposition factor for the tip of the pulse when i cm 1/ icmax is the largest. In the case of icmax and load resistance to rp being a fixed value, output power will reach maximum. However, at this time the amplifier is in the state of category ab and is too inefficient. Figure 6-9 decomposition coefficients for tipping pulses are known by curve: extreme? C = 0, if? = 1,? C can reach 100%. In order to balance power with efficiency, the best angle is around 70? The following is an analysis of the changes in the gb mass icm1, the ut efficiency c and the output power of the po with the transhipment angle? C to select the appropriate working state。
