RFIC Design

1
RFIC Design

• Dr. Fotowat Ahmadi
• Tehran University
• Fall-1386

2
RFIC Design

• Section Zero

3
Section Zero

4
Section Zero

5
Section Zero

6
Section Zero

7
Section Zero

8
Section Zero

9
Section Zero

10
Section Zero

11
Section Zero

12
Section Zero

13
Section Zero

14
Section Zero

15
Section Zero

16
Section Zero
Impedance
Ideal capacitor
capacitive
inductive
frequency
Fr

17
Section Zero

18

• Distributed capacitance and series resistance in
  an inductor

Cd
Cd
17
19
Section Zero

20
18
21
Section Zero

22
Section Zero

23
Section Zero

24
Section Zero

25
Section Zero

26
Section Zero

27
Section Zero

28
Section Zero

29
Section Zero

30
Section Zero

31
Section Zero

32
Section Zero

33
Section Zero

34
Section Zero

35
Section Zero

36
Section Zero
12.87pf
384nH
12.87pf
87nH
87nH

37
Section Zero

38
Section Zero

39
Section Zero

40
Section Zero

41
Section Zero

42
Section Zero

43
Section Zero

44
Section Zero

45
Section Zero

46
Section Zero

47
Section Zero

48
Section Zero
What if an impedance match is required over
fairly wide bandwidth? Select a virtual
resistor to be in between the source and load.
46

49
Section Zero

50
Section Zero

51
Section Zero

52
50
53
Section Zero
51

54
Section Zero
Constant Resistance and Reactance Circles
1
52

55
Section Zero
53

56
Section Zero
0.5J0.7
Z0.5j0.7
-j1
-J1.0
Z0.5-j0.3
0.5-J0.3
-j1
54

57
Section Zero
Z0.8j0.8
0.8J0.8
Z0.5j0.7
-j1
j1.8
J1.8
Z0.5-j0.3
Z0.8-j1
0.8-J1.0
55

58
Section Zero

59
Section Zero

60
Section Zero
Admittance chart

61
Section Zero
Y0.2j0.5
J0.8
Y0.2j0.3

62
Section Zero
Y0.7-J1.0
-J1.5
Y0.7J0.5

63
Section Zero
C
jX1
jX1.4
jX0.9
R1
-jB1.1
-jB0.3
B
A
E
D
E
B
A
C
D
Z0.2j0.5 ? (E)
61

64
Solution of the problem stated in the previous
slide
65
Section Zero
Shunt C
Series C
Shunt L
Series L
63

66
Section Zero

67
Section Zero
25-j15 ?
159 nH
38.7 pF
100-j25 ?
25j15 ?

68
Zs(C)0.5j0.3
C
A
ZL(A)2-j0.5
B
65
69
Section Zero

70
Section Zero

71
Circuit Q Representation on the Smith Chart
Q5
0.1j0.5
1j5
Q0
1-j5
0.1-j0.5
67
72
Section Zero

73
Section Zero

74
Section Zero

75
Section Zero
Q5
B
A
C
I
Q5

76
15j15 ?
318 nH
995 nH
81pF
225 ?
77
Example Design a T-Network (II)
Q5
B
A
C
I
Q5
72
78
B
(2)
(1)
A
(3)

79
Section Zero

80
Section Zero

81
Section Zero

82
Section Zero

83
Section Zero

84
Section Zero

85
Section Zero

86
Section Zero

87
Section Zero

88
Section Zero

89
Section Zero

90
Section Zero

91
Section Zero

92
Negative Feedback Bias
Self-Bias
87
93
Section Zero

94
Section Zero

95
Section Zero

96
Section Zero

97
Section Zero

98
Section Zero

99
Section Zero

100
Section Zero

101
Section Zero

102
Section Zero

103
Section Zero

104
Section Zero

105
Section Zero

106
Section Zero

107
Section Zero

108
Section Zero

109
Section Zero

110
Section Zero

111
Section Zero

112
Section Zero

113
Section Zero

114
Section Zero

115
Section Zero
GL
GS

116
Section Zero
A50?
16-j7 ?
B
B
(500.33)
23pF
13nH
(50)
111

117
Section Zero
C16-j7 ?
A50?
B

118
Section Zero

119
Section Zero

120
Section Zero

121
Section Zero

122
Section Zero
C
A1-j1 ?
B

123
Section Zero
C
A1-j1 ?
B

124
Section Zero
C
Gs0.105?160?
A0.7-j1.2
B

125
Section Zero

126
Section Zero

127
Section Zero

128
Section Zero
Unstable region
Input Stability Circle
Output Stability Circle
123

129
Section Zero
Output Stability Circle
Input Stability Circle

130
Section Zero

131
Section Zero

132
Section Zero

133
To Center Of Input Stability Circle
12dB constant gain circle
To Center Of Output Stability Circle
Output Stability Circle
Input Stability Circle

134
To Center Of Input Stability Circle
12dB constant gain circle
To Center Of Output Stability Circle
GL
GS
Output Stability Circle
Output Stability Circle
Input Stability Circle
129
135
Section Zero

136
Section Zero

137
Section Zero

138
Section Zero

139
Section Zero
A(75?)
B

140
Section Zero
B
GL0.427?60.7?
A
ZL100 ?

141
Section Zero

142
Section Zero

• What did we review?
• Smith chart
• Impedance matching
• Amplifier design with S-parameters
• More questions
• Why 50 ohms?
• Why S-parameters?
• How do we measure S-parameters?

137