Philips UAA2077CM-C1 Datasheet

DATA SH EET

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

1997 Sep 24

INTEGRATED CIRCUITS

UAA2077CM

2 GHz image rejecting front-end

1997 Sep 24 2

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

supply voltage 3.6 3.75 5.3 V

I

CC(RX)

receive supply current 27.5 36 44.5 mA

I

CC(TX)

transmit supply current 11 14 17.5 mA

I

CC(PD)

supply current in power-down −−50 µA

T

amb

operating ambient temperature −30 +25 +75 °C

1997 Sep 24 3

Philips Semiconductors Product specification

2 GHz image rejecting front-end UAA2077CM

ORDERING INFORMATION

BLOCK DIAGRAM

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

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

Fig.1 Block diagram.

handbook, full pagewidth

MGD285

LNA

MIXER

IF

COMBINER

low-noise

amplifier

5

3

15

16

6

18

19

20

17

9

11314 2

TXINATXINBLOINB

MIXER

LOINA

4 7

IFA

IFB

TXOA
TXOB

n.c. n.c. SXON

10

SBS

12

+45

o

+135

o

RXON

11

TXON

QUADRATURE

PHASE

SHIFTER

RFINA
RFINB

8

LNAGND

LOGND

V

CCLNA

V

CCLO

UAA2077CM

RECEIVE SECTION

TRANSMIT SECTION

LOCAL OSCILLATOR

SECTION

1997 Sep 24 4

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

3 supply voltage for LNA, IF parts

and TX mixer
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

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

grounded for f

LO<fRF

)
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

15 supply voltage for LO parts
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

(balanced)

TXOB 20 transmit mixer IF output B

(balanced)

Fig.2 Pin configuration.

handbook, halfpage

UAA2077CM

MGD286

1
2
3
4
5
6
7
8
9

10

TXINA
TXINB

V

CCLNA

SBS

n.c.
RFINA
RFINB

n.c.

LNAGND

SXON

TXOB
TXOA
IFB

TXON

IFA
LOGND
V

CCLO

LOINA
LOINB
RXON

20
19
18
17
16
15
14
13
12
11

1997 Sep 24 5

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

CC

for the DC current should be
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.

Fig.3 Block diagram, receive section.

handbook, full pagewidth

MGD754

LNA

IF

COMBINER

IF

amplifier

IF

amplifier

MIXER

MIXER

RXON

LOIN

IFA

IFB

RFINA
RFINB

SBS

LNAGND

V

CCLNA

+45

o

+135

o

1997 Sep 24 6

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

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

CC

for DC path, at each TX
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.

Fig.4 Block diagram, LO section.

handbook, halfpage

MGD287

LOINB

to TX

to RX

LOINA

QUAD

LOGND

V

CCLO

SXON

Fig.5 Block diagram, transmit mixer.

handbook, halfpage

MGD153

TXINATXINB

TXON

LOIN

TX MIXER

TXOA
TXOB

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