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參數資料
| 型號： | BGB110 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網絡 |
| 英文描述： | Bluetooth radio module |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, XMA34 |
| 封裝： | 13.75 X 10.20 X 1.90 MM, LEADLESS, METAL CAP, SOT, MODULE-34 |
| 文件頁數： | 10/17頁 |
| 文件大?。?/td> | 141K |
| 代理商： | BGB110 |
2000 Oct 03
10
Philips Semiconductors
Objective specification
Bluetooth radio module
BGB110
Fig.5 Reset timing
POR_EXT
POR
LPO_CLK
VS_DIG
OSC
SYS_CLK
SYS_CLK_REQ
Phase 1 Rdy = 0
Phase 2 Rdy = 1
Transmit mode
The BGB110 TrueBlue Bluetooth radio module contains a fully integrated transmitter function. The RF channel frequency
is selected in a conventional synthesizer, which is controlled via the serial JTAG interface. After the RF frequency has
settled, the power amplifier is switched on and the modulation input is preset to its mean value. The RF frequency is
allowed to resettle, to overcome possible frequency pulling effects, and the synthesizer loop is opened.
The data stream present on the TX_DATA line is Gaussian filtered and converted to an analog signal which then directly
modulates the VCO. The robust design of the VCO makes it unnecessary to trim its freerunning frequency. This leads to
a lower component cost. A carefully designed PLL loop filter keeps frequency drift during open-loop modulation down to
a very low value.
The output stage of the transmit chain active part is balanced, for reduced spurious emissions (EMC). It is connected
through a balun (balanced-to-unbalanced) circuit to the TX/RX switch. This switch is controlled by internal logic circuits
in the active die. The balun circuit has built-in selectivity, to further reduce out-of-band spurious emissions.
Receive mode
Also the receiver functionality is fully integrated. It is a near-zero-IF (1 MHz) architecture with active image rejection. The
sensitive RX input of the active die is a balanced configuration, in order to reduce unwanted (spurious) responses. The
balun structure to convert from unbalanced to balanced signals has built-in selectivity. This suppresses GSM-900
frequencies by more than 40 dB. For better immunity to DCS, DECT, GSM-1800 and W-CDMA signals, an extra
band-pass filter has been included.
The synthesizer PLL is switched off during demodulation. This reduces the effects that reference frequency breakthrough
may have on receiver sensitivity, and also reduces the power consumption. The demodulator contains an advanced AFC
circuit. This reduces the effects of frequency mismatch between (remote) transmitter and receiver. These may be caused
by differences in reference frequency, but also by frequency drift during open-loop modulation and demodulation.
The demodulated RF signal is sampled and compared against a reference (slicer) value and then output on the
RX_DATA line. An RSSI output with a high dynamic range of nearly 50 dB provides information on the quality of the
signal received. The RSSI value is read out via the JTAG interface, as described above.
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