- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382702 > U2797B 1000-MHz Quadrature Modulator PDF資料下載
參數(shù)資料
| 型號： | U2797B |
| 英文描述： | 1000-MHz Quadrature Modulator |
| 中文描述： | 1000 - MHz的正交調(diào)制器 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 255K |
| 代理商： | U2797B |
TELEFUNKEN Semiconductors
U2797B
Rev. A1: 06.09.1995
11 (13)
Application notes
1. Noise floor and settling time
In order to reduce noise on the power down control input
and improve the wide-off noise floor of the 900-MHz RF
output signal, capacitor C
PD
should be connected from
pin 8 to ground in the shortest possible way.
The settling time has to be considered for the system un-
der design. For GSM applications a value of C
PD
= 1 F
defines a settling time, t
sPD
, equal or less than 3 s. This
capacitance does not have any influence on the noise floor
within the relevant GSM mask. For mobile application
the mask requirements can be achieved very easily with-
out C
PD
.
A significant improvement of the wide-off noise floor is
obtainable with C
PD
greater than 100 nF. Such values are
recommended for applications where the settling time is
not critical, such as in base stations. Coupling capacitors
for LO
i
and RF
O
also have a certain impact on the settling
time. The values used for the measurements are C
LOi
=
100 pF and C
RFo
= 1 nF.
Mixer input stage
A, B
A, B
94 8187 e
Figure 1 baseband input circuitry
U2797B-FS (SSO 20) has a 150 k baseband input impedance. The reference voltage, V
REF
, is provided at pin 13.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| U2893B | Modulation PLL for GSM, DCS and PCS Systems |
| U3500BM | Cordless Telephone Signal Processor |
| U3500BM-BFL | Cordless Telephone Signal Processor |
| U3500BM-BFLG3 | Cordless Telephone Signal Processor |
| U3501BM | Cordless Telephone Signal Processor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| U2797B-AFS | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:1000-MHz Quadrature Modulator |
| U2797B-AFSG3 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:1000-MHz Quadrature Modulator |
| U27AC14100 | 制造商:Amphenol Canada 功能描述:- Trays |
| U27AC14-100 | 制造商:Amphenol Canada 功能描述:USB A TYPE RECEPTACLE (L/F - Trays |
| U27-AC24-100 | 制造商:Amphenol Corporation 功能描述:I/O CONN, RECEPTACLE, 4WAY, Connector Type:USB A, Series:-, Gender:Receptacle, N |
發(fā)布緊急采購，3分鐘左右您將得到回復。