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PDF AN96106 Data sheet ( Hoja de datos )
| Número de pieza | AN96106 | |
| Descripción | Imahe Rejecting Front Ends | |
| Fabricantes | Philips | |
| Logotipo |  |
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APPLICATION NOTE
Image Rejecting Front-Ends
UAA207X family
AN96106
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Philips
Semiconductors
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Philips Semiconductors
Image Rejecting Front-Ends
Application Note
CONTENTS
1. BASIC THEORY OF IMAGE REJECTION ....................................................................................................6
2. INTRODUCTION TO THE IMAGE REJECTING FRONT ENDS....................................................................9
2.1 Common Features ................................................................................................................................10
2.2 the UAA2072M .....................................................................................................................................11
2.3 the UAA2073M and UAA2073AM..........................................................................................................11
2.4 the UAA2077AM, UAA2077BM and UAA2077CM .................................................................................11
3. FUNCTIONAL DESCRIPTION ....................................................................................................................11
3.1 Power-down modes ..............................................................................................................................11
3.2 Pin function diagram .............................................................................................................................14
3.3 Phase shifter.........................................................................................................................................16
4. IMPEDANCE MATCHING CONSIDERATIONS ..........................................................................................18
4.1 Introduction...........................................................................................................................................18
4.2 Impedance Matching.............................................................................................................................18
4.3 Balun Design ........................................................................................................................................19
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5. TYPICAL APPLICATION CIRCUITS...........................................................................................................20
5.1 Worked Examples.................................D..a..t.a..S...h..e..e..t4..U.....c..o..m......................................................................20
5.1.1 RF input ......................................................................................................................................20
5.1.2 TX input ......................................................................................................................................20
5.1.3 IF output .....................................................................................................................................21
Matching ....................................................................................................................................21
Balun .........................................................................................................................................22
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6. MEASUREMENTS and RESULTS..............................................................................................................23
6.1 Matching results....................................................................................................................................23
6.2 Linearity / spurious response.................................................................................................................26
6.3 Image rejection .....................................................................................................................................28
6.4 Gain, compression point and IP3...........................................................................................................30
7. DEMONSTRATION BOARD .......................................................................................................................33
7.1 Schematic drawings ..............................................................................................................................33
7.2 Component lists ....................................................................................................................................35
7.3 Layout and assembly drawings .............................................................................................................37
8. REFERENCES ............................................................................................................................................41
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Philips Semiconductors
Image Rejecting Front-Ends
Application Note
The image reject mixer gives typically over 30 dB of image rejection (see Table 1). This means little RF input
filtering is necessary, enabling the use of only one low-cost RF input filter. Moreover, the removal of the bulky
expensive ceramic image filter enables smaller phone designs.
The performance is such that all critical RF parameters are stable over the entire temperature and voltage
ranges.
Particularities of each circuit are described below.
2.2 the UAA2072M
Its supply voltage ranges from 4.5 to 5.3 V ; it is intended to be used in the GSM cellular telephones. To adjust
for maximum image rejection performance at a given IF, a control logic programmable via the 3-wire serial bus
interface is provided. This permits indeed compensation for process spreads and trimming for the chosen IF
frequency and the LO band center frequency. The power-up of the transmit, receive and LO buffers as well as
the selection of sideband rejection are also programmable by the 3-wire serial bus.
2.3 the UAA2073M and UAA2073AM
The UAA2073M is the second generation front-end for 900 MHz applications. It offers better performance than
the UAA2072M.
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The supply voltage range is lower, from 3.6 to 5.3 V with a typical 3.75 V supply. The power consumption has
been improved to 26 mA typically in receive mode. The whole control block for tuning image rejection has been
suppressed. The image rejection is optimum whDeantatSheheIFet4frUeq.cuoemncy is equal to 71 MHz.
The UAA2073AM is a derivative of the UAA2073M, with an IF frequency equal to 175 MHz. The image
frequency rejection has been improved to 45 dB but at the expense of a reduced range of possible IF
frequencies.
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2.4 the UAA2077AM, UAA2077BM and UAA2077CM
In order to meet the rapidly increasing demand for mobile radio 1800 MHz equipment, the UAA2077AM, the
UAA2077BM and UAA2077CM have been developed and have become the new generation of image rejection
ICs.
The UAA2077AM is intended for use in the digital cordless system DECT, the UAA2077BM and UAA2077CM in
the digital cellular systems DCS1800 and PCS1900. One particularity of the UAA2077AM is that it doesn’t
include a transmit block. One the other hand, the voltage supply can be reduced up to 3.15 V for temperature
from 0 to 70 °C. This offers the possibility to connect directly the chip to an unregulated 3-cell battery supply.
The UAA2077BM has been designed for DCS1800 applications. The UAA2077CM, a derivative of that IC, was
designed initially to address the stringent requirements of PCS1900 applications but is also suitable for
DCS1800 applications.
3. FUNCTIONAL DESCRIPTION
3.1 Power-down modes
The UAA2072M is the only one of this ICs’ family to feature software power-down modes. For the five other
circuits, several power-down modes are exclusively controlled by hardware input pins. Let’s take the example of
the UAA2073M. According to the block-diagram, 3 different functional areas are defined:
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