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參數(shù)資料
| 型號(hào)： | TDA5745TS |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 衰減器 |
| 英文描述： | DIODE: SCHOTTKY, 60V, 1A, PACKAGE SMA |
| 中文描述： | RF/MICROWAVE DOUBLE BALANCED MIXER |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 123K |
| 代理商： | TDA5745TS |
1998 Mar 09
11
Philips Semiconductors
Preliminary specification
Low power mixers/oscillators for
hyperband tuners
TDA5744; TDA5745
Fig.8 Input circuit for optimum noise figure in the VHF band.
(a) For f
= 50 MHz:
VHF mixer frequency response measured = 57 MHz;
loss = 0 dB.
Image suppression = 16 dB.
C1 = 1 nF; C2 = 2.2 pF.
L1 = 7 turns (
5.5 mm; wire
= 0.5 mm).
I1 = semi rigid cable (RIM): 5 cm long.
(semi rigid cable (RIM); 33 dB/100 m; 50
; 96 pF/m).
(b) For f
= 150 MHz:
VHF mixer frequency response measured = 150.3 MHz;
loss = 1.3 dB.
Image suppression = 13 dB.
C3 = 1 nF; C4 = 2.2 pF.
I2
=
semi rigid cable (RIM): 30 cm long.
I3 = semi rigid cable (RIM): 5 cm long.
(semi rigid cable (RIM); 33 dB/100 m; 50
; 96 pF/m).
handbook, full pagewidth
MBE286 - 1
L1
C2
C1
PCB
plug
plug
BNC
BNC
RIM-RIM
I1
C4
C3
PCB
RIM-RIM
I3
I2
(a)
(b)
F = F
meas
loss (of input circuit) (dB).
Fig.9 Noise figure (F) measurement in the VHF band.
handbook, full pagewidth
MGL277
VHFIN IFOUT1
IFOUT2
D.U.T.
NOISE
SOURCE
NOISE
FIGURE
METER
BNC
RIM
INPUT
CIRCUIT
C
T
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