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Three in Software
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Barcode Drawer In None Using Barcode generation for Software Control to generate, create bar code image in Software applications. Code128 Generation In None Using Barcode drawer for Software Control to generate, create ANSI/AIM Code 128 image in Software applications. FIGURE 3105 Class A lumped linear ampli er without a bias circuit
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USPS Confirm Service Barcode Maker In None Using Barcode generation for Software Control to generate, create USPS Confirm Service Barcode image in Software applications. Create EAN13 In None Using Barcode drawer for Microsoft Excel Control to generate, create EAN 13 image in Excel applications. Both the lumped amplifier of Fig 3105 and the distributed amplifier of Fig 3106 can function as linear Class A amplifiers They can perform with high temperature stability without the assistance of the gain reducing and stability robbing emitter resistor (The emitter resistor possesses a small value of inductance, which is an issue in high VHF and above amplifier applications) No bias resistors are required due to the inclusion of the DC active bias circuit of Fig 3107, which includes a positive-negative-positive (PNP) biasing transistor and its associated diode Figures 3108 and 3109 show the completed and biased amplifiers, both lumped and distributed Below demonstrates how to design the active biasing network for a high-frequency Class A lumped or distributed amplifier GS1 128 Creation In Java Using Barcode creation for Java Control to generate, create EAN / UCC - 13 image in Java applications. GS1 128 Encoder In Objective-C Using Barcode creator for iPhone Control to generate, create UCC-128 image in iPhone applications. To Design
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CAP RF INPUT CAP
RF TRANSISTOR
RF OUTPUT
FIGURE 3106
Class A distributed linear ampli er without a bias circuit
Amplifier Design
+VCC
ID CB PNP CB CB RFC
IC (OF BIASED DEVICE) VBE (OF BIASED DEVICE) VCE (OF BIASED DEVICE) FIGURE 3107
Class A active bias circuit
3 Select a VCC for the active bias network that is approximately 2 or 3 V greater than the VCE required for the RF transistor of Fig 3105 or 3106 4 Select an RFC for the active bias circuit with the appropriate SRF (self resonant frequency) that is greater than the frequency of operation 5 Select both a silicon PNP transistor with a beta of at least 30 and a low-frequency silicon diode (a PNP transistor is used so that the VCC may be a positive voltage) 6 R1 = 7 R3 = 8 R2 = +VCC VCE ID +VCC VCE IC VCE 07 ID VCE 1 IC R1 (VCC 07 ) R3 (R1 + R2 ) 9 R4 = MIN
10 Collector current of biased device will be: IC =
11 Collector-to-emitter voltage of biased device will be: VCE = VCC (IC R3 ) 12 CB = < 1 XC
Three
+VCC
D CB PNP RFC R2 CB R4 CB CB CB CB
RF OUTPUT RF INPUT RF TRANSISTOR
FIGURE 3108
Class A lumped linear ampli er with active bias
Class A JFET Self-Bias, Common-Source Amplifier for VHF and Below (Fig 3110) To Design
1 Select a Vdd and an appropriate Vgs for Class A operation from the data sheet for the JFET selected, and note the Id for this chosen Vgs 2 RS = Vgs Id 3 Select a Vds of
Vdd (2 Vgs ) V for a Vd of dd 2 2 Vdd Vds Vgs 4 Rd = (If Rd computes to lower than 1 k , an RFC must be used Id between the top of Rd and the Vdd in order to sustain a minimum RF impedance into the power supply) Amplifier Design
+VCC
D CB PNP CB CB
CB R4
VCE VBE RFC
RF INPUT
RF TRANSISTOR
RF OUTPUT
FIGURE 3109
Class A distributed linear ampli er with active bias and matching circuits
5 Place a high impedance RFC (with an appropriate SRF) or a high-value resistor (1 M ) from the FET s gate to ground 6 CC = CS < 1 NOTES : a Always confirm that the FET will safely dissipate the power required, which is P = Id
Vd b Since Vgs for a specific Id is not always available, use the following equation to find Vgs when Idss and Vp are known (look in the JFET data sheet for Idss and Vp): Vgs = Vp 1 Id Idss (Vp Vgs(off) and Vs = Vgs) c The Id and Vds will normally be chosen as a duplicate of the values used in any available S-parameter file for the device to be modeled In fact, many manufacturers of FETs will have S-parameters that are taken at different values of Vds and Id The Id can be quoted as a percent of Idss (the maximum Id) such as 50% of Idss , which would work well for Class A bias Three
Vd CC INPUT Ig = 0 mA G D Vgs S Vg
CC OUTPUT Vds VS = Vgs
RS Id
FIGURE 3110
JFET biasing up to medium frequencies
Class A Bias, JFET HF Stable Amplifier (Fig 3111) To Design
1 Select a Q-point (Vdd, Id, and Vd = Vdd/2) 2 Vgs Vdd Vd 2 Rd = I d = Idss 1 Id Vp
Rd Vd
Igg R1
IG = 0 G D JFET S VS Vgs Vg Id RS
FIGURE 3111
A low-frequency Class A JFET bias circuit
Amplifier Design
3 Find Vp and dss from data sheet 4 Vgs = Vp 1 6 RS = VS/Id 7 Vg = Vgs + Vs 8 Use an R1 value of 220 k (this effects the DC input resistance) 9 R2 = R1 (Vdd Vg ) Vg Id Idss 5 Select VS to be 2 or 3 V
NOTE : The Id and Vds will usually be chosen as a duplicate of the values used in any available
S-parameter file for the device to be modeled In fact, many manufacturers of FETs will have S-parameters available taken at different values of Vds and Id (Id is usually quoted as a percent of Idss (the maximum Id) such as 50% of Idss, which would work well for Class A bias) Class C Bias, BJT Power Amplifier (Fig 3112)
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