RF2908 查看數據表（PDF） - RF Micro Devices

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产品描述 (功能)

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RF2908

915MHZ SPREAD SPECTRUM RECEIVER WITH PLL FREQUENCY SYNTHESIZER

RF Micro Devices 

RF2908

Differential Filter Design Information

Butterworth Response

RS

L

C1

RS

L

RL

C2

RL

11

C1

=

-C----1---b----w-----⋅----12------⋅---1---0---1--2-

2 ⋅ π ⋅ fc ⋅ RL

;C

2

=

C-----2---b----w-----⋅---12-------⋅---1---0---1--2-

2 ⋅ π ⋅ fc ⋅ RL

;L

=

-L---b---w------⋅---R----L-----⋅---1---0---6-

2 ⋅ π ⋅ fc

C1bw = 4.5325;C2bw = 13.5691;Lbw = 0.1743

RS = 125;RL = 1000;R-R---L-S- = 0.125

100000

10000

1000

100

10

1

1.E+05

Differential LC Filter Component Values

(Butterworth Response)

1.E+06

Frequency

C2 (pF)

C1 (pF)

L (µH)

1.E+07

11-92

Rev C1 010904

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