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1 R1 = 301 k (1% tolerance) 2 R2 = 3010 (1% tolerance) VOUT 1 123
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3 For proper operation, the minimum permitted input voltage should be calculated as: VIN(min) = VOUT + 25 V (which must never be below 4 V) 4 L1 should be a shielded magnetic of 68 H with a 15-A capability 5 D1 must be a high efficiency Schottky type capable of 60 V and 2 A 6 CIN must be a low ESR type of 15 F at 35 V 7 COUT must be low ESR type of 220 F at 10 V
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Directional couplers are 50- circuits designed to allow an RF signal to pass from their input port through to their output port (called the mainline of the coupler) with minimum insertion loss, while permitting a small part of this signal to be tapped (Fig 874) Depending on the particular type of coupler, the tapped signal may be 30, 20, or 10 dB less than the coupler s mainline output, so the actual loss at this mainline output port is quite small The low-power-tapped signal can be a sample from the forward (incident) signal that was injected into the coupler s input port, or it may be the power from any reflected (reverse) wave present, depending on the coupler s orientation There are also dual directional couplers that will measure both the forward and reverse power simultaneously through two separate ports Most couplers are relatively narrowband, and must be chosen or designed with a certain frequency range in mind Figure 875 shows a typical microwave distributed directional coupler The coupler s mainline insertion loss is the loss from Port 1 to Port 2 (such as 04 dB); the
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FIGURE 874 A directional coupler
COUPLED ISOLATED
COUPLED LINE
INPUT 1
MAIN LINE Zo
2 OUTPUT
FIGURE 875 A distributed directional coupler circuit
Support Circuit Design
coupled port loss is the amplitude at Port 3, in decibel, relative to Port 1 (such as 6, 12, 20 dB, and so on); while the isolated Port 4 may well have up to 60 dB less signal than that at Port 1
Directional Coupler Design
The lumped low loss LC directional coupler shown below is a narrowband structure, while the Adam s 50- resistive coupler will work in very wideband applications Miniature surface-mount single-chip ceramic directional couplers are also available that operate up to 24 GHz, with low insertion loss and extremely simple implementation, but their cost is higher
A Lumped LC Directional Coupler for up to 1 GHz (Fig 876)
To Design
1 R = 50 (By replacing R with a 50- amplifier, or by placing a high-impedance circuit in shunt with R, will permit the sensing of reverse power) 2 L = 50 2 f 1 2 f 50 018 10( CF/20 ) (This C2 value must be less than 2 f 50 ) 2 f 50
3 C1 = 4 C2 =
where CF = coupling, in dB, desired at Port 3, which must be less than 15 dB for this type of coupler, and must be in the form of X dB in the equation, and not as +X dB or X dB This CF value will remain within specifications over a maximum 10% bandwidth
PORT 1 RF INPUT
L C1 C2 L C1
PORT 2 RF OUTPUT
C2 L
PORT 3 COUPLED OUTPUT
FIGURE 876
An LCR lumped directional coupler
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L 87 nH L 87 nH Port_2 50 C1 35 pF C2 035 pF C1 35 pF L 87 nH R 50 L 87 nH Port_3 50 C2 035 pF
Port_1 50
PORT1-TO-PORT2 IL, PORT1-TO-PORT3 IL, PORT2-TO-PORT3
10 THROUGH-PORT IL 22 ALL PORTS RL 34 PORT1 RL, PORT2 RL, PORT3 RL (dB)
5 0 5 10
15 COUPLED-PORT IL 20 25 30 35 40 45 50 800 846 892 938 Frequency (MHz) PORT2-TO-PORT3 ISOLATION
PORT1-TO-PORT2 IL PORT1-TO-PORT3 IL PORT1 RL PORT2 RL PORT3 RL PORT2-TO-PORT3 IL
70 1030
FIGURE 877 The example narrowband LC directional coupler with calculated part s values, along with port-to-port insertion loss (IL) and return loss (RL) results
A Quick Example Design a Lumped Directional LC Coupler (Fig 877) Goal: Create a low-loss lumped LC directional coupler The specifications and parameters for the circuit are: fr = 915 MHz ZIN = 50 ZOUT = 50 Coupling = 20 dB
Support Circuit Design
RS PORT 1 RT PORT 3 RU RS PORT 2
PORT 3
PORT 2
(COUPLED LOSS) (MAINLINE LOSS)
30 25 20 15 10
05 10 17 30 49
16 29 50 86 138
763 407 222 112 47
53 56 63 78 136
FIGURE 878 An Adam s wideband directional coupler, with different design resistor values for various Port 3 coupling output powers
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