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參數(shù)資料
| 型號： | GC4116 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | MULTI-STANDARD QUAD DUC CHIP |
| 中文描述： | 多標(biāo)準(zhǔn)四數(shù)字上芯片 |
| 文件頁數(shù)： | 14/57頁 |
| 文件大?。?/td> | 401K |
| 代理商： | GC4116 |
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GC4116 MULTI-STANDARD QUAD DUC CHIP
DATA SHEET REV 1.0
19992001
GRAYCHIP,INC.
- 9 -
APRIL 27, 2001
This document contains preliminary information which may be changed at any time without notice
The NCO’s spur level is reduced to below -113 dB
through the use of phase dithering. The spectrums in Figure
9 show the NCO spurs for a worst case tuning frequency
before and after dithering has been turned on. Notice that the
spur level decreases from -105 dB to -116 dB. Dithering is
turned on or off using the DITHER_SYNC controls in
addresses 8 through 11.
The worst case NCO spurs at -113 to -116dB, such as
the one shown in Figure 9(b), are due to a few frequencies
that are related to the sampling frequency by multiples of
F
CK
/96 and F
CK
/124. In these cases the rounding errors in
the sine/cosine lookup table repeat in a regular fashion,
thereby concentrating the error power into a single
frequency, rather than spreading it across the spectrum.
These worst case spurs can be eliminated by selecting an
initial phase that minimizes the errors or by changing the
tuning frequency by a small amount (50 Hz). Setting the
initial phase to 4 for multiples of F
CK
/96 or F
CK
/124 (and to 0
for other frequencies) will result in spurs below -115 for all
frequencies.
Figure 10 shows the maximum spur levels as the tuning
frequency is scanned over a portion of the frequency range
with the peak hold function of the spectrum analyzer turned
on. Notice that the peak spur level is -107 dB before dithering
and is -121 dB after dithering has been turned on and the
phase initialization described above has been used.
3.4
THE OVERALL INTERPOLATION
FILTER RESPONSE
The image rejection of the up-convert channel is equal
to the stop band rejection of the overall interpolation filter
response. The overall response is obtained by convolving
the interpolated responses of the PFIR and CFIR filters and
CIC filter response. The overall response and appropriate
transmit masks are shown in Figure 11 for four common
standards. Figure 11a shows the overall response for IS136
(also referred to as DAMPS). Figure 11b shows the response
for GSM (input at 2 samples per bit). Figures 11c & d shows
the response for IS95 and 3.84 MB UMTS.
(a) IS136
(b) GSM
(c) IS95
(d) 3.84 MB UMTS
TO IS95 Transmit Mask
Figure 11. Overall Filter Response
IS136 Transmit Mask
GSM Transmit Mask
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| GC4116-PB | 功能描述:上下轉(zhuǎn)換器 4 Ch Narrowband DDC Monitor RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| GC4116-PBZ | 功能描述:上下轉(zhuǎn)換器 4 Ch Narrowband DDC Monitor RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| GC-41259-02 | 制造商:Microsemi Corporation 功能描述:DIODE - Bulk |
| GC4-12F1 | 制造商:GC Electronics 功能描述:Lead Acid Rectangular 12V 4Ah Rechargeable |
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