This paper describes a RF front-end based on current conveyors for DVB-SH (2.17-2.2 GHz) implemented in an UMC CMOS 90 nm process. This receiver includes a Low Noise Amplifier (LNA), a Single to Differential Converter and a Mixer. The LNA is based on current conveyors topology. The Single to Differential Converter generates a pair of differential output signals from a single input, which have balanced amplitude and phase. This converter is followed by a mixer based on current conveyors. Post-layout simulations show a conversion gain of 22.7 dB, a 14.1 dB noise figure, an input return loss (S11) of -11.2 dB and an output third-order intercept point (IP3) of 11.5 dBm. This combination draws 22.4 mW from a ±1.2 V supply.

LNA

CIRCUITS ANALYSIS

A RF receiver based on current conveyors for DVB-SH was implemented in an UMC CMOS 90 nm process. This RF receiver includes a LNA, a Single to Differential Converter and a Mixer. The LNA is based on current conveyors topology. The Single to Differential Converter generates a pair of differential output signals from a single input, which have balanced amplitude and phase. This converter is followed by a mixer based on current conveyors. Post-layout simulations show a conversion gain of 22.7 dB, a 14.1 dB noise figure, an input return loss (S11) of -11.2 dB and an output IP3 of 11.5 dBm. This combination draws 22.4 mW from a ±1.2 V supply.

CONCLUSIONS

RF FRONTEND SPECIFICATIONS FOR A DVB-SH

LNA•The LNA based on current conveyors.•This architecture consists of a common gate gain stage M1, followed by a source follower stage M2. •Io1 and Io2 are used to bias the transistors with CMOS current mirrors.

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This work is partially supported by the Spanish Ministry of Science and Innovation (TEC2008-06881-C03-01 and TEC2011-28724-C03-02) ,the Spanish Ministry of Industry, Tourism and Trade (TSI-020400-2010-55) and the “Programa de ayudas de Formación del Personal investigador, de la Agencia Canaria de Investigación, Innovación y Sociedad de la Información del Gobierno de Canarias y la cofinanciación y tasa de cofinanciación del F.S.E.”.

ACKNOWLEDGEMENTS

DCIS 2012Avignon (France), 28-30 November

SINGLE-TO-DIFFERENTIAL CONVERTER •It generates a pair of differential output signals from a single input. •The bypass capacitor C reduces the error between the phases.•The gain of the circuit can be modified with the control voltages in order to use as automatic control gain

MIXER• A potentiometric MOSFET mixer with current conveyors connected as a transimpedance amplifier.• The RF and LO signal frequencies can range from 2.17-2.2 GHz. • The current conveyors transform the output switching quad current into a voltage. • To improve the linearity a class AB output stage (M4, M14, M5 and M15) has been employed. • The core of the current conveyor is composed of M6-M9, while the transistors M1-M3 and M10-M13 are used as current sources.

AN RF RECEIVER BASED ON CURRENT CONVEYORS FOR DVB-SHH. García-Vázquez, V. Pérez, R. Díaz, Sunil L. Khemchandani, J. del Pino

Receiver Architecture Zero-IF

Sensitivity -112.55 dBm

Noise Figure 3dB

Maximum Gain 92.55 dB

Dynamic Range 86.05 dB

Maximum Input Level -25 dBm

Max. Required CNR 11.2 dB

Max. Channel Bandwidth 8 MHz

IIP3 -0.17 dBm

ACS 60 dB

RF Frequency 2.17-2.2 GHz

Architecture Cero-IF

Channel Bandwidth 8 MHz

S11 -11.2 dB

Conversion Gain 22.7 dB

NF@4MHz 14.1 dB

Output IP3 11.5 dBm

Supply ±1.2 V

Power Comsumption 22.4 mW

Area (excluding pads) 0.26 mm x 0.13 mm

1 2 3 4 5 6 7 8 9 10-20

-18

-16

-14

-12

-10

-8

-6

-4

-2

0

S11

(dB

)

Frequency (GHz)

S11

1,8 1,9 2,0 2,1 2,2 2,3 2,4 2,50

5

10

15

20

25

30

CG

(dB

)

Frequency (GHz)

CG

1,8 1,9 2,0 2,1 2,2 2,3 2,4 2,50

2

4

6

8

10

12

14

16

18

20

NF

(dB

)

Frequency (GHz)

NF

-120 -100 -80 -60 -40 -20 0 20

-160

-140

-120

-100

-80

-60

-40

-20

0

20

PO

UT

(dB

m)

PIN(dBm)

Fundamen. IM3

VDD

VSS

M 1 M 2

1Io

M 3

1Io 2Io

2Io

OUTIN

VDD

R L

M 2

C

M 3

R L

R

IN

1VB

1VB

2VB M 1

OUT

V L O +

V L O -

V R F -

V R F +

V R F +

M 1

M 2

M 3

M 4

I I F +

I I F -

R L

X

YZ

X

YZ

X

VDD

Z

VSS

Y

M 8 M 9

M 1 5

M 6 M 7

M 5

M 4

M 1 4

M 1 0 M 1 1

M 1

IDC

M 2 M 3

M 1 2 M 1 3

RESULTS

SINGLE TO DIFFERENTIAL CONVERTER

ABSTRACT

MIXER