BLUECORE4-ROM datasheet(39/89 Pages) ETC

39 / 89 page

Description of Functional Blocks

BC41B143A-ds-002Pd

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Page 39 of 89

Description of Functional Blocks

8.1

RF Receiver

The receiver features a near-zero Intermediate Frequency (IF) architecture that allows the channel filters to be

integrated on to the die. Sufficient out-of-band blocking specification at the Low Noise Amplifier (LNA) input

allows the radio to be used in close proximity to Global System for Mobile Communications (GSM) and Wideband

Code Division Multiple Access (W-CDMA) cellular phone transmitters without being desensitised. The use of a

digital Frequency Shift Keying (FSK) discriminator means that no discriminator tank is needed and its excellent

performance in the presence of noise allows BlueCore4-ROM CSP to exceed the Bluetooth requirements for

co-channel and adjacent channel rejection.

For EDR, an Analogue to Digital Converter (ADC) is used to digitise the IF received signal.

8.1.1

Low Noise Amplifier

The LNA can be configured to operate in single-ended or differential mode. Single-ended mode is used for

Class 1 Bluetooth operation. Differential mode is used for Class 2 operation.

8.1.2

Analogue to Digital Converter

The Analogue to Digital Converter (ADC) is used to implement fast Automatic Gain Control (AGC). The ADC

samples the Received Signal Strength Indicator (RSSI) voltage on a slot-by-slot basis. The front-end LNA gain is

changed according to the measured RSSI value, keeping the first mixer input signal within a limited range. This

improves the dynamic range of the receiver, improving performance in interference limited environments.

8.2

RF Transmitter

8.2.1

IQ Modulator

The transmitter features a direct IQ modulator to minimise the frequency drift during a transmit timeslot, which

results in a controlled modulation index. Digital baseband transmit circuitry provides the required spectral

shaping.

8.2.2

Power Amplifier

The internal Power Amplifier (PA) has a maximum output power of +6dBm allowing BlueCore4-ROM CSP to be

used in Class 2 and Class 3 radios without an external RF PA. Support for transmit power control allows a simple

implementation for Class 1 with an external RF PA.

8.2.3

Auxiliary DAC

An 8-bit voltage Auxiliary DAC is provided for power control of an external PA for Class 1 operation or for any

other customer specific application.

8.3

RF Synthesiser

The radio synthesiser is fully integrated onto the die with no requirement for an external Voltage Controlled

Oscillator (VCO) screening can, varactor tuning diodes, LC resonators or loop filter. The synthesiser is

guaranteed to lock in sufficient time across the guaranteed temperature range to meet the Bluetooth Specification

v2.0 + EDR.

8.4

Power Control and Regulation

BlueCore4-ROM CSP contains one linear 1.8V regulator which may be used to power the 1.8V supplies of the

device.

BLUECORE4-ROM Datasheet(PDF) 39 Page - List of Unclassifed Manufacturers

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