PMB2240 Siemens Semiconductor Group, PMB2240 Datasheet

PMB2240

Manufacturer Part Number

PMB2240

Description

Manufacturer

Siemens Semiconductor Group

Datasheets

1.PMB2247.pdf (2 pages)

2.PMB2240.pdf (31 pages)

3.PMB2240.pdf (31 pages)

Specifications of PMB2240

Case

QFP-48

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GSM Transmitter

PCN Transmitter

PCS Transmitter

General Description

The PMB 2240, 2245, 2247 family are single-chip

transmitters which include a prescaler for the RF-oscillator

signal and a fixed PLL for the IF-oscillator signal. The

transmitter family is designed for use in combination with the

single-chip receiver family PMB 2405, 2407 and the PLL PMB

2307 for mobile telephones according to the GSM, PCN and

PCS standards and other vector modulated digital systems. It

is fabricated using Siemens B6HF silicon process:

GSM Chipset

PMB 2240

PMB 2405

PMB 2307

The PMB 2240/45/47 transmitters include the active

structures for the main oscillator circuit. Alternatively the

oscillator signal can be supplied from an external source. The

oscillator signal is buffered for off-chip use.

There is a prescaler by 64/65 for the RF-oscillator signal on

chip, which can be used to implement the PMB 2307 PLL

circuit.

The on-chip FIX-PLL consists of the system clock divider, the

IF-oscillator signal divider, the phase detector and the charge

pump. The IF-oscillator signal divider is driven by the

oscillator on the PMB 2405/07 or by an external discrete

VCO. The IF-oscillator signal divider ratio of PMB 2240 and

PMB 2245 is fixed. It can be selected either divided by 1 or by

3 using PMB 2247 and PMB 2407 to drive the FIX-PLL with

two IF frequencies (450 MHz or 150 MHz) to avoid spurious

problems for PCS application.

The two oscillator signals (IF and RF) are combined in the

transmit mixer, and the image sideband and other mixing

products are to be suppressed by an external interstage filter.

The filtered signal reenters the chip at the modulator inputs.

The modulator generates two orthogonal carriers which are

mixed with the I- and Q modulation signals by two multipliers.

The phase between the two carriers can be fine-adjusted to

90 (orthogonality) by two external resistors for maximum

SSB suppression. The outputs of the multipliers are added

and amplified by a linear output stage.

Siemens Aktiengesellschaft

PCN Chipset

PMB 2245

PMB 2407

PMB 2307

PCS Chipset

PMB 2247

PMB 2407

PMB 2307

PLL

Type

PMB 2240-F

PMB 2245-F

PMB 2247-F

Application

• Vector modulated cellular and cordless systems:

• PMB 2240: GSM, PDC, DAMPS

• PMB 2245: PCN, PCS, PHS

• PMB 2247: PCN, PCS, etc.

• Various modulation schemes, such as PM, PSK, FSK,

• Analog systems with FM- and AM modulation

• Space and power saving optimizations of existing discrete

Features

• Transmitter with I/Q modulator

• Direct I/Q modulation

• Generation of orthogonal carriers with possibility of phase

• 30-dB carrier rejection, 40-dB SSB rejection

• 48-dB rejection of third order products with 500-mVpp

• High output power with appropriate power matching

• Integrated active part of RF oscillator

• Possibility to use external RF-oscillator signal

• The RF-oscillator signal is buffered for off-chip use,

• Prescaler for the RF-oscillator signal

• Possibility to use the IF oscillator integrated on the

• Possibility to use external IF-oscillator signal

• Fixed IF frequency PLL (FIX-PLL) for IF-VCO (PMB 2240,

• Supply voltage range 2.7 to 5.5 V

• P-TQFP-48 package

• Temperature range – 30 C to 85 C

QAM, QPSK, GMSK etc.

transmitter circuits

adjust with external resistors

I/Q-drive level

network at 500-mVpp I/Q-drive level

PMB 2240: – 3 dBm, PMB 2245: – 6 dBm

PMB 2247: – 8 dBm

especially for receiver PMB 2405/07

PMB 2405/07

2245), switchable IF PLL working at 450-MHz or 150-MHz

IF frequency (PMB 2247)

Package

P-TQFP-48-1 (SMD)

PMB 2240

PMB 2245

PMB 2247

B6HF

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