BLU Products BLU DASH, Руководство по обслуживанию

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1
1-2-2 chip typical application
1.3 RF Part
RF part mainly includes antenna system, transmit access, receive access and
frequency synthesizer for GSM or UMTS channel tune .
RF circuit mainly finish wireless signal receive and sending, it completes voice and
signal duplex transmit with BTS by air interface. For detailed, receive circuit finish
received BTS high frequency signal AGC enlargement, down convert, cause certain scope
imitation base band I/Q signal, send to base circuit to make other process.
Transmitter circuit finishes base band sending data signal modulation and power
enlargement, cause outburst pulse signal that correspond with GSM or UMTS standard
demand and transmit the signal to BTS through antenna. RF circuit performance
will influence directly the mobile signal communication effect.
RF part is composed of RF transceiver (MT6162), plus a power amplifier, antenna
switch, filter and other peripheral devices.MT6162 is a single-chip multi-mode transceiver
offering unparalleled integration and feature set resulting in industry’s lowest eBoM. It is
fully compliant with 3G mode(3GPP Rel.6),as well as supporting GSM/GPRS/EDGE
modes(GGE).
RF circuit includes: receiver part, transmitter part. RF application circuit is shown as
Image 1-3:
1-3 RF application circuit