Philips UAA2077CM Datasheet

INTEGRATED CIRCUITS

DATA SH EET

UAA2077CM

2 GHz image rejecting front-end

Product specification
Supersedes data of 1996 Oct 02
File under Integrated Circuits, IC17

1997 Sep 24

Philips Semiconductors Product specification

2 GHz image rejecting front-end UAA2077CM

FEATURES

• Low-noise, wide dynamic range amplifier

• Very low noise figure

• Dual balanced mixer for over 30 dB on-chip image

rejection

• IF I/Q combiner at 188 MHz

• On-chip quadrature network

• Down-conversion mixer for closed-loop transmitters

• Independent TX/RX fast ON/OFF power-down modes

• Very small outline packaging

• Very small application (no image filter).

APPLICATIONS

• High frequency front-end for DCS1800/PCS1900
hand-portable equipment

• Compact digital mobile communication equipment

• TDMA receivers e.g. RF-LANS.

GENERAL DESCRIPTION

UAA2077CM contains both a receiver front-end and a high
frequency transmit mixer intended to be used in mobile
telephones. Designed in an advanced BiCMOS process it
combines high performance with low power consumption
and a high degree of integration, thus reducing external
component costs and total front-end size.

The main advantage of the UAA2077CM is its ability to
provide over 30 dB of image rejection. Consequently, the
image filter between the LNA and the mixer is suppressed.

Image rejection is achieved in the internal architecture by
two RF mixers in quadrature and two all-pass filters in
I and Q IF channels that phase shift the IF by 45° and 135°
respectively. The two phase shifted IFs are recombined
and buffered to furnish the IF output signal.

Signals presented at the RF input at LO + IF frequency are
rejected through this signal processing while signals at
LO − IF frequency can form the IF signal.

The receiver section consists of a low-noise amplifier that
drives a quadrature mixer pair. The IF amplifier has
on-chip 45° and 135° phase shifting and a combining
network for image rejection. The IF driver has differential
open-collector type outputs.

The LO part consists of an internal all-pass type phase
shifter to provide quadrature LO signals to the receive
mixers. The all-pass filters outputs are buffered before
being fed to the receive mixers.

The transmit section consists of a low-noise amplifier, and
a down-conversion mixer. In the transmit mode, an internal
LO buffer is used to drive the transmit IF down-conversion
mixer.

All RF and IF inputs or outputs are balanced.
Pins RXON, TXON and SXON allow to control the different

power-down modes. A synthesizer-on (SX) mode enables
LO buffers independent of the other circuits. When
pin SXON is HIGH, all internal buffers on the LO path of
the circuit are turned on, thus minimizing LO pulling when
remainder of the receive or transmit chain is powered up.
Special care has been taken for fast power-up switching.

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

V

CC

I

CC(RX)

I

CC(TX)

I

CC(PD)

T

amb

supply voltage 3.6 3.75 5.3 V
receive supply current 27.5 36 44.5 mA
transmit supply current 11 14 17.5 mA
supply current in power-down −−50 µA
operating ambient temperature −30 +25 +75 °C

1997 Sep 24 2

Philips Semiconductors Product specification

2 GHz image rejecting front-end UAA2077CM

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

UAA2077CM SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1

BLOCK DIAGRAM

handbook, full pagewidth

V

CCLNA

RFINA
RFINB

LNAGND

V

CCLO

n.c. n.c. SXON

4 7

3

5
6

8

15

UAA2077CM

LNA

low-noise

amplifier

MIXER

TXON

RXON

11

12

+45

+135

o

o

9

IF

COMBINER

RECEIVE SECTION

TRANSMIT SECTION

SBS

10

17

IFA

18

IFB

LOGND

16

LOCAL OSCILLATOR

SECTION

QUADRATURE

PHASE

SHIFTER

LOINA

Fig.1 Block diagram.

MIXER

TXINATXINBLOINB

19

TXOA
TXOB

20

11314 2

MGD285

1997 Sep 24 3

Philips Semiconductors Product specification

2 GHz image rejecting front-end UAA2077CM

PINNING

SYMBOL PIN DESCRIPTION

TXINA 1 transmit mixer input A (balanced)
TXINB 2 transmit mixer input B (balanced)
V

CCLNA

n.c. 4 not connected
RFINA 5 RF input A (balanced)
RFINB 6 RF input B (balanced)
n.c. 7 not connected
LNAGND 8 ground for LNA, IF parts and TX

SXON 9 SX mode enable (see Table 1)
SBS 10 sideband selection (should be

TXON 11 TX mode enable (see Table 1)
RXON 12 RX mode enable (see Table 1)
LOINB 13 LO input B (balanced)
LOINA 14 LO input A (balanced)
V

CCLO

LOGND 16 ground for LO parts
IFA 17 IF output A (balanced)
IFB 18 IF output B (balanced)
TXOA 19 transmit mixer IF output A

TXOB 20 transmit mixer IF output B

3 supply voltage for LNA, IF parts

and TX mixer

mixer

grounded for f

LO<fRF

)

15 supply voltage for LO parts

(balanced)

(balanced)

handbook, halfpage

1

TXINA

2

TXINB

n.c.
RFINA
RFINB

n.c.

SXON

SBS

3
4
5

UAA2077CM

6
7
8
9

10

V

CCLNA

LNAGND

Fig.2 Pin configuration.

MGD286

20
19
18
17
16
15
14
13
12
11

TXOB
TXOA
IFB
IFA
LOGND
V

CCLO

LOINA
LOINB
RXON
TXON

1997 Sep 24 4

Philips Semiconductors Product specification

2 GHz image rejecting front-end UAA2077CM

FUNCTIONAL DESCRIPTION
Receive section

The circuit contains a low-noise amplifier followed by two
high dynamic range mixers. These mixers are of the
Gilbert-cell type, the whole internal architecture is fully
differential.

The local oscillator, shifted in phase to 45° and 135°,
mixes the amplified RF to create I and Q channels.
The two I and Q channels are buffered, phase shifted by
45° and 135° respectively, amplified and recombined
internally to realize the image rejection.

Pin SBS allows sideband selection:

• f

LO>fRF

(SBS = 1)

• fLO<fRF (SBS = 0).
Where fRF is the frequency of the wanted signal.

Balanced signal interfaces are used for minimizing
crosstalk due to package parasitics.

The IF output is differential and of the open-collector type.
Typical application will load the output with a 680 Ω
resistor load at each IF output, plus a differential 1 kΩ load
made of the input impedance of the IF filter or the input
impedance of the matching network for the IF filter.
The power gain refers to the available power on this 1 kΩ
load. The path to V

for the DC current should be

CC

achieved via tuning inductors. The output voltage is limited
to VCC+3Vbe or 3 diode forward voltage drops.

Fast switching, ON/OFF, of the receive section is
controlled by the hardware input RXON.

handbook, full pagewidth

V

CCLNA

RFINA
RFINB

LNAGND

LNA

MIXER

MIXER

LOIN

IF

amplifier

IF

amplifier

+45

+135

o

o

RXON

Fig.3 Block diagram, receive section.

SBS

IFA

IF

COMBINER

IFB

MGD754

1997 Sep 24 5

Philips Semiconductors Product specification

2 GHz image rejecting front-end UAA2077CM

Local oscillator section

The Local Oscillator (LO) input directly drives the two
internal all-pass networks to provide quadrature LO to the
receive mixers.

A synthesizer-ON mode (SX mode) is used to power-up all
LO input buffers, thus minimizing the pulling effect on the
external VCO when entering receive or transmit mode.
This mode is active when SXON = 1.

Transmit mixer

This mixer is used for down-conversion to the transmit IF.
Its inputs are coupled to the transmit RF which is

handbook, halfpage

V

CCLO

to RX

QUAD

down-converted to a modulated transmit IF frequency,
phase locked with the baseband modulation.

The IF outputs are HIGH impedance (open-collector
type).Typical application will load the output with a 560 Ω
resistor load, connected to V

for DC path, at each TX

CC

output, plus a differential 1 kΩ made of the input
impedance of the matching network for the following TX
part. The mixer can also be used for frequency
up-conversion.

Fast switching, ON/OFF, of the transmit section is
controlled by the hardware input TXON.

handbook, halfpage

LOIN

TX MIXER

TXOA
TXOB

LOGND

LOINB

LOINA

SXON

Fig.4 Block diagram, LO section.

to TX

MGD287

TXON

TXINATXINB

Fig.5 Block diagram, transmit mixer.

Table 1 Control of power status

EXTERNAL PIN LEVEL

CIRCUIT MODE OF OPERATION

TXON RXON SXON

LOW LOW LOW power-down mode
LOW HIGH LOW RX mode: receive section and LO buffers to RX on

HIGH LOW LOW TX mode: transmit section and LO buffers to TX on

LOW LOW HIGH SX mode: complete LO section on

LOW HIGH HIGH SRX mode: receive section on and SX mode active
HIGH LOW HIGH STX mode: transmit section on and SX mode active
HIGH HIGH X receive section and transmit section on; specification not guaranteed

MGD153

1997 Sep 24 6