TRF2020

SYNTHESIZER FOR GLOBAL SYSTEM

FOR MOBILE (GSM) CELLULAR TELEPHONES

SLWS020B – FEBRUARY 1995 – REVISED JANUARY 1998

6

POST OFFICE BOX 655303

I2

I1

I2

I1

Current

Voltage

∆ IOUT REL

∆ IOUT MATCH

ISINK

ISOURCE

∆ IOUT REL

V1

V2

Figure 1. Charge-Pump Output Current Definitions

The relative output current variation is defined as the percent difference between charge-pump current output

at two charge-pump output voltages and the mean charge-pump current output:

DI

OUT REL

I

OUT MEAN

+ 2

(I

2

–I

|(I

2

) I

Output current matching is defined as the difference in charge-pump sinking current output and charge-pump

sourcing current output at a given charge-pump output (see Figure 1).

charge-pump leakage currents, charge pumps not active

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PDM

PDA1

IOZ

Disabled output current

PDA2

VO = 0.5VDDA,

RPM=RPA=VDDA

10

nA

IOZ

Disabled output current

SWM

RPM = RPA = VDDA,

Normal and speed-up modes

10

nA

SW1

Normal and s eed u modes

SW2