PDF CX77301 Data sheet ( Hoja de datos )

Número de pieza	CX77301
Descripción	PA Module for Dual-Band EGSM900
Fabricantes	Conexant Systems
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No Preview Available ! Preliminary Information This document contains information on a new product. The parametric information, although not mfully characterized, is the result of testing initial devices. CPAXM7tao7dSuh3lee0efot14rUD.ucoal-band EGSM900 / DCS1800 / GPRSThe CX77301 is a dual-band Power Amplifier Module (PAM) designed in a compact form factor for Class 4 EGSM900 and Class 1 DCS1800 operation that aalso supports multi-slot transmission for Class 10 General Packet Radio Service .D(GPRS) operation. wThe module consists of an EGSM900 PA block, a DCS1800 PA block, impedance w matching circuitry for 50 Ω input and output impedances, and bias control w circuitry. Two separate Heterojunction Bipolar Transistor (HBT) PA blocks are mfabricated on a single Gallium Arsenide (GaAs) die. One PA block operates in the EGSM900 band and the other PA block supports the DCS1800 band. Optimized ofor lithium ion battery operation, both PA blocks share common power supply .cpins to distribute current. A custom CMOS integrated circuit provides the internal interface circuitry, including a current amplifier that minimizes the required power control current (IAPC) to 10 µA, typical. The GaAs die, the USilicon (Si) die, and passive components are mounted on a multi-layer laminate substrate. The assembly is encapsulated with plastic overmold. t4The RF input and output ports are internally matched to 50 Ω to reduce the number of external components for a dual-band design. Extremely low leakage ecurrent (2 µA, typical) of the dual PA module maximizes handset standby time. eThe CX77301 also contains band-select switching circuitry to select EGSM (logic 0) or DCS (logic 1) as determined from the Band Select (BS) signal. In the hFunctional Block Diagram shown below, the BS pin selects the PA output (DCS OUT or EGSM OUT) while the Analog Power Control (APC) controls the Slevel of output power. Distinguishing Features • High efficiency: EGSM 55% DCS 50% • Input/output matching 50 Ω internal • Small outline 9.1 mm x 11.6 mm • Low profile 1.5 mm maximum • Low APC current 10 µA typical • Gold plated, lead-free contacts. Applications • Dual-band cellular handsets encompassing Class 4 EGSM900, Class 1 DCS1800, and up to Class 10 GPRS multi-slot operation. taFunctional Block Diagram www.Da omDCSIN U.cPower Control t4Band Select heeEGSM IN Match CMOS Bias Controller Match www.DataSData Sheet VCC HBT Match Match DCS OUT EGSM OUT 100956D © 2001, Conexant Systems, Inc., All Rights Reserved. January 2, 2002 1 page CX77301 PA Module for Dual-band EGSM900 / DCS1800 / GPRS Electrical Specifications Table 3. CX77301 Electrical Specifications (3 of 4)(1) Parameter Symbol Test Condition 2nd to 7th Harmonics Output Power Input VSWR Forward Isolation Switching Time Spurious 2f0 to 7f0 POUT POUT MAX POUT MAX ΓIN POUT STANDBY τRISE, τFALL Spur BW = 3 MHz 0 dBm ≤ POUT≤ 32 dBm VCC = 3.5 V VAPC ≈ 2.0 V TCASE = +25 °C VCC = 2.9 V VAPC ≤ 2.6 V TCASE = –20 °C to +100 °C (See Table 2 for multi-slot) PIN = 5 dBm VCC = 4.8 V VAPC ≤ 2.6 V TCASE = –20 °C to +100 °C (See Table 2 for multi-slot) PIN = 5 dBm POUT = 0 to 32 dBm, controlled by VAPC PIN = 10.5 dBm VAPC = 0.3 V Time from POUT = –10 dBm to POUT = 0 dBm, τ ≈ 90% Time from POUT = –10 dBm to POUT = +20 dBm, τ ≈ 90% Time from POUT = –10 dBm to POUT = +31.5 dBm, τ ≈ 90% All combinations of the following parameters: VAPC = Controlled(3) PIN = min. to max. VCC = 2.9 V to 4.8 V Load VSWR = 8:1, all phase angles Min Typical Max Units — — –7 dBm 31.5 32.0 — dBm 29.5 30.5 — dBm 29.5 30.5 — dBm — — 2:1 — — –40 –35 dBm — 10 12 µs —5 8 µs —2 5 µs No parasitic oscillation > –36 dBm 100956D Jannuary 2, 2002 Conexant 4 5 Page CX77301 PA Module for Dual-band EGSM900 / DCS1800 / GPRS Technical Information Technical Information CMOS Bias Controller Characteristics The CMOS die within the PAM performs several functions that are important to the overall module performance. Some of these functions must be considered for development of the power ramping features in a 3GPP compliant transmitter power control loop1. Power ramping considerations will be discussed later in this section. The four main functions that will be described in this section are Standby Mode Control, Band Select, Voltage Clamp, and Current Buffer. The functional block diagram is shown in Figure 6. Figure 6. Functional Block Diagram vodcs cpdcs CComp Band Select (pin16) APC input (pin14) Supply (pin6) cpgsm vogsm CComp Combinational Logic Voltage Clamp Bandgap Reference CMOS bias controller DCS1800 bias out Cbypass RF Isolation ground Cbypass GSM900 bias out RF Isolation Dual Band GaAs Power Amplifier Die 100956_01 1. Please refer to 3GPP TS 05.05, Digital Cellular Communications System (Phase 2+); Radio Transmission and Reception. All GSM specifications are now the responsibility of 3GPP. The standards are available at http://www.3GPP.org/3G_specs/spec_titles.htm 100956D Jannuary 2, 2002 Conexant 10 11 Page

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