求选频器（直放站上的那种）资料
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Maxim 优化噪声系数的低噪声放大器匹配技术I1
I2 NOISY TWO-PORT NETWORK (a)
I1
Vn1 NOISELESS TWO-PORT NETWORK (b)
Vn2
I2
(LNA)
RF RF IF
V1
V2
V1
V2
1. (b)
(a) Vn1 Vn2
2 I n1 I n2 5 6
I1 = Y11V 1+ Y 12V 2 + In1 I2 = Y21V1 + Y22V2 + I n2
(
5)
(
6)
― ( Vn1 V n1 V n2 1b
V1 = Z11I1 + Z12 I 2 + Vn1 V2 = Z 21I1 + Z 22 I 2 + Vn2
( 1)
2 1a ) 1b) Z
In1
In2 7 8
( 7)
Vn2 1 2
(
I n1 = I1 V1 = V2 = 0 I n2 = I2 V1 = V2 = 0
(
8)
1b
2
(
2)
I1 NOISELESS TWO-PORT NETWORK I2
1
2
Vn1
Vn2 ( 3 4)
( 3)
(I1 = I2 = 0)
V1
In1
In2
V2
Vn1 = V1 I1 = I 2 = 0 Vn2 = V2 I1 = I 2 = 0
(
4) 2. In1 In2
Vn1
Vn2
12
(
3)
ABCD 9 10
3 I n1
( 9)
Vn I n2
In
2
V1 = AV2 + B( I2 ) + Vn I1 = CV2 + D( I2 ) + In
I Vn = n2 Y21 Y In = In1 11 In2 Y21
(
17)
(
10)
9 Vn
10 3 In
I1 Vn
(
18)
Vn 1b
In V n1 V n2 Ys
I2 NOISY TWO-PORT NETWORK (a)
I1
Vn1 NOISELESS TWO-PORT NETWORK (b)
Vn2
I2
(LNA)
RF RF IF
V1
V2
V1
V2
1. (b)
(a) Vn1 Vn2
2 I n1 I n2 5 6
I1 = Y11V 1+ Y 12V 2 + In1 I2 = Y21V1 + Y22V2 + I n2
(
5)
(
6)
― ( Vn1 V n1 V n2 1b
V1 = Z11I1 + Z12 I 2 + Vn1 V2 = Z 21I1 + Z 22 I 2 + Vn2
( 1)
2 1a ) 1b) Z
In1
In2 7 8
( 7)
Vn2 1 2
(
I n1 = I1 V1 = V2 = 0 I n2 = I2 V1 = V2 = 0
(
8)
1b
2
(
2)
I1 NOISELESS TWO-PORT NETWORK I2
1
2
Vn1
Vn2 ( 3 4)
( 3)
(I1 = I2 = 0)
V1
In1
In2
V2
Vn1 = V1 I1 = I 2 = 0 Vn2 = V2 I1 = I 2 = 0
(
4) 2. In1 In2
Vn1
Vn2
12
(
3)
ABCD 9 10
3 I n1
( 9)
Vn I n2
In
2
V1 = AV2 + B( I2 ) + Vn I1 = CV2 + D( I2 ) + In
I Vn = n2 Y21 Y In = In1 11 In2 Y21
(
17)
(
10)
9 Vn
10 3 In
I1 Vn
(
18)
Vn 1b
In V n1 V n2 Ys
关键词： Maxim 优化 噪声 系数 的低 放大 器匹 配技
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