Preliminary Information

SATURN

CDMA/AMPS dual Band IF Receiver for Digital Phones

Preliminary Information

Description

The SATURN circuit is designed for use in dual band dual
mode mobile phones (CDMA/AMPS). The circuit is
designed to be compataible with digital baseband and
mixed signal circuit chips from Mitel (Planet Chip-set)
and Qualcomm (MSM2 and BBA). A wideband AGC
amplifier allows the input of CDMA or AMPS signal paths
with a range power management control options.

Features

Selectable IF input buffers with characteristic
impedance suitable for interface to IF CDMA and
FM SAW filter outputs

AGC amplifiers with 90dB of variable gain, fully
compensated for temperature variation

IQ demodulator with accurately defined output DC
level and low DC offsets

LO operating at twice frequency with high accuracy
quadrature generation

Sophisticated power management control operation

Overload indicator

DS4721

Issue 4.2

April 1999

Odering Information

SATURN/KG/QP1S
SATURN/KG/QP1T

Figure 1 Block diagram

Temperature

Comp.

DLL

I OUT

IF OUT

FM IFIN

Q OU T

Gain

Control

Mode

Control

CDMA IFIN

AGC

STARTUP

ENABLE

MODE CDM

VHF BUF

VHF RES

PRESCALER

Overload

Indicator

OVERLOAD DET

BAND 1900

VHF VCC

VHF VEE

IF VCC

IF VEE

SATURN

Preliminary Information

Figure 2 Pin Connections

QSOP28

IF VCC

IF OUTB

IF OUT

IF VEE

GND

CDMA IFIN

CDMA IFINB

FM IFIN

FM IFINB

AGC

AGCB

MODE CDMA

ENABLE

GND

VHF VCC
I OUTB
I OUT
VHF VEE
OVERLOAD DET
VHF RES
VHF RESB
BAND 1900
VHF BUF
VHF BUFB
GND
Q OUT
Q OUTB
STARTUP

Pin Description

Pin No

Pin Name

Description

IF VCC

Supply for IF inputs and AGC blocks

IF OUTB

Post AGC IF output

IF OUT

Post AGC IF output

IF VEE

Ground for IF inputs and AGC blocks

GND

Substrate ground

CDMA IFIN

Post SAW IF input (CDMA)

CDMA IFINB

Post SAW IN input (CDMA)

FM IFIN

Post SAW IF input (FM)

FM IFINB

Post SAW IF inputs (FM) (AC ground)

AGC

AGC Control for IF section

AGCB

AGC control for IF sections (AC ground)

MODE CDMA

CDMA/FM mode select

ENABLE

Power up AGC sections of device

GND

Substrate Ground

STARTUP

Power up Oscillator, DLL and Mixer sections of the device

QOUTB

Q channel baseband output

OUT

Q Channel baseband output

GND

Ground

VHF BUFB

VHF oscillator buffered output for synthesiser

VHF BUF

VHF oscillator buffered output for synthesiser

BAND 1900

VHF oscillator tuning band select input

VHF RESB

VHF VCO resonator

VHF RES

VHF VCO resonator

OVERLOAD DET

Overload detector output

VHF VEE

Ground for VHF VCO and DLL blocks

I OUT

I channel baseband output

I OUTB

I channel baseband output

VHF VCC

Supply for VHF and DLL blocks

Preliminary Information

SATURN

Electrical Characteristics

(Mode Control)

Description

ENAVLE STARTUP

MODE CDMA BAND 1900

Conditions

Standby Mode

All circuits powered down
except logic inputs

Start up Mode

For high band IF
(210.38MHz)

For low band IF (85.38MHz)

Turns on VCO circuits, DLL
quadrature generation,
prescaler and IQ
demodulator. All other
circuits remain powered
down

CDMA mode

For high band IF
(210.38MHz)

For low band IF (85.38MHz)
All circuits operational
except for IF output buffer,
CDMA input stage selected.

FM Mode

All circuits operational
except for IF output buffer,
FM input stage selected.

Alternative FM mode

Note 4

CDMA IF AGC

Demodulator and LO

only mode

generation circuitry powered
down. IF output buffer
enabled

FM IF AGC

Demodulator and LO
generation circuitry powered
down. IF output buffer
enabled.

X = Don't Care

Notes

STARTUP mode is provided to allow VCO/DLL/prescalers to stabilise before signal path is activated. This is a power-saving
feature since the signal path is redundant during this period. If this feature is not required, the ENABLE and STARTUP
control pins can be shorted together so that all circuitry is activated at the same time.

In high band mode (Band 1900 = 1) the VCO operates at twice the IF frequency. For example if IF = 210.38MHz then the
oscillator operates at 420.76MHz. A delay locked loop (DLL) circuit then generates the quadrature LO signals. The prescaler
output, VHFBUF, is VCO frequency divided by 8 (52.494MHz).

In low band mode (Band 1900 = 0) the VCO operates at 4 times the IF frequency. for example if IF = 85.38MHz the oscillator
operates at 341.52MHz. This is then divided and uses DLL circuit to provide the quadrature LO signals. The prescaler output,
VHFBUF, is VCO frequency divided by 8 (42.69MHz).

This mode can be used for FM. The VCO operates at twice the LO frequency. This mode is not normally used as a large

tuning range is required on the VCO. Prescaler output is LO frequency divided by four.

SATURN

Preliminary Information

Electrical Characteristics (DC specifications)

Tamb= 30

�

C to +70

�

C, Vcc = +2.7 to +3.6. These characteristics are guaranteed by either production test or design.

They apply within the specified ambient temperature and supply voltage unless otherwise stated.

Characteristic

Value

Units

Conditions

Min

Typ

Max

General

Supply Voltage

2.7

3.0

3.6

All Vcc Pins

Operating temperature

-30

�

Ambient See note 1

Current Consumption

Standby Mode

0.03

0.1

Startup Mode

CDMA Mode

FM Mode

CDMA AGC only Mode

FM AGC only Mode

Mode Control Logic

CMOS input logiv high, VIH

Vcc-0.5

Vcc+0.1

All logic inputs

CMOS input high current, IIH

-10

�

All logic inputs

CMOS input low current, IIL

-10

�

All logic inputs

Switching time between any two Modes

AGC Control

0.1

2.6

AGC Input impedance

100

130

160

DC Common Mode voltages

I OUT, I OUTB (CDMA Mode)

Vcc-0.8 Vcc-0.6 Vcc-0.4

I OUTB, QOUTB

I OUT< Q OUT (FM Mode)

Vcc-0.8 Vcc-0.6 Vcc-0.4

I OUTB, Q OUTB

Note 1. Specifications are guaranteed over -30 to + 70

�

C, however operation is guaranteed over the extended range

of -30 to +85

�

C with minimal variation in specified parameters.

Absolute Limits

Description

Min

Typ

Max

Units

Comments

Supply Voltage

4.0

Volts

Operation temperature, Tamb

-30

+85

�

Ambient temperature

Storage temperature, Tstg

-40

+125

�

Junction temperature, Tj

-30

+125

�

Power dissipation

350

Maximum Pin Voltage

Vcc+0.6

Volts

All pins except Vcc and GND

Minimum Pin Voltage

-0.6

Volts

All pins except Vcc and GND

ESD voltage

1.75

Human Body Model

Preliminary Information

SATURN

Electrical Characteristics (AC specifications) Continued

Tamb= 30

�

C to +70

�

C, Vcc = +2.7 to +3.6. These characteristics are guaranteed by either production test or design.

They apply within the specified ambient temperature and supply voltage unless otherwise stated.
Frequency = 210.38MHz

Characteristic

Value

Units

Conditions

Min

Typ

Max

CDMA AGC

Max Voltage Gain to demodulator

To demodulator outputs

output

Min Voltage Gain to demodulator

-55

-47

To demodulator

output

Max Voltage Gain to IF buffer output

-43

IF AGC only mode

Min voltage Gain to IF buffer output

-51

-49

IF AGC only mode

AGC control Max

2.6

Gain = Gain max

AGC control Min

0.1

Gain = Gain min

Gain slope

dB/V

Gain slope linearity

dB/V

Over gain control range

Gain temperature stability

-2

Channel gain variation

-0.1

0.1

Within channel bandwidth

@ 210.38MHz

Gainmax

5.5

6.5

Rs (500

)

Input V1dB

Gainmin

110

�

Minimum gain

104

�

Power (500

)

IIP3

Gainmin

114

120

�

Minimum gain

Input impedance

500

With addition of external

resistor across IF inputs

IF Frequency

250

MHz

CDMA to Amps isolation

SATURN

Preliminary Information

Electrical Characteristics (AC specifications) Continued

Tamb= 30

�

C to +70

�

C, Vcc = +2.7 to +3.6. These characteristics are guaranteed by either production test or design.

They apply within the specified ambient temperature and supply voltage unless otherwise stated.
Frequency = 85.38MHz

Characteristic

Value

Units

Conditions

Min

Typ

Max

FM AGC

Max Voltage Gain to demodulator

To demodulator outputs

output

Min Voltage Gain to demodulator

-49

-47

To demodulator

output

Max Voltage Gain to OF buffer output

IF AGC only mode

Min voltage Gain to IF buffer output

-48

-42

IF AGC only mode

AGC control Max

2.6

Gain = Gain max

AGC control Min

0.1

Gain = Gain min

Gain slope

dB/V

Gain slope linearity

dB/V

Over gain control range

Gain temperature stability

-2

For any gain setting

Gainmax

850

source

Input V1dB

Gainmin

105

�

Minimum gain

IIP3

Gainmin

103

113

�

Minimum gain

Input Impedance

850

With addition of external

resistor across IF inputs

IF Frequency

250

MHz

VHF Local Oscillator

Quaderature generation

LO input Frequency

100

500

MHz

VCO Phase noise

-100

-98

dBc/Hz @30kHz, Hiband mode

Minimum tank Q=15 Note 1

VCO Noise floor

-130

dBc/Hz @>3MHz, Note 1

VCO buffer output

350

pk-pk single ended

VCO buffer output impedance

100

Differential

Note 1: Phase noise is specified at the LO input to the mixers.

Preliminary Information

SATURN

Electrical Characteristics (AC specifications) Continued

Tamb= 30

�

C to +70

�

C, Vcc = +2.7 to +3.6. These characteristics are guaranteed by either production test or design.

They apply within the specified ambient temperature and supply voltage unless otherwise stated.

Characteristic

Value

Units

Conditions

Min

Typ

Max

Demodulator Output

I OUT, I OUTB, Q OUT, Q OUTB

I/Q Gain matching

0.1

0.25

I/Q Phase matching

0.5

deg

Output impedance

Differential

Baseband Bandwidth

MHz

Defined by on-chip first order

low-pass filter

Output IP3

117

119

�

Baseband differential DC offset

3.5

Overload Detect

Referred to baseband outputs

CDMA Mode

104

�

FM Mode

106

�

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Электронный компонент: QP1T