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Features
* * * * * * * *
Active Mixer with Conversion Gain No External LO Driver Necessary Low LO Drive Level Required RF and LO Ports May Be Driven Single-ended Single 5-V Supply Voltage High LO-RF Isolation Broadband Resistive 50- Impedances on All Three Ports Small SSO16 Package
Applications
* Digital Communication Systems * 800 MHz to 1000 MHz Transceivers for Base Stations
Electrostatic sensitive device. Observe precautions for handling.
800-1000 MHz High Linearity SiGe Active Receive Mixer T0780
Description
The T0780 is a high linearity active mixer which is manufactured using Atmel's advanced Silicon-Germanium technology. This mixer features a frequency range of 800 MHz to 1000 MHz. It operates from a single 5-V supply and provides 10 dB of conversion gain while requiring only 0 dBm input to the integrated LO driver. An IF amplifier is also included. The T0780 incorporates internal matching on each RF, IF and LO port to enhance ease of use and to reduce the external components required. The RF and LO inputs can be driven differentially or single-ended.
Preliminary
Figure 1. Block Diagram
RFP RFN
4 5 1 16 13
IFP IFN
LOP 12 LON
Rev. 4525B-SIGE-09/02
1
Pin Configuration
Figure 2. Pinning SSOP16
IFP VCC GND RFP RFN GND VCC L1
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
IFN VCC GND LOP LON GND VCC L2
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol IFP VCC GND RFP RFN GND VCC L1 L2 VCC GND LON LOP GND VCC IFN Function IF positive output 5-V power supply Ground RF positive input RF negative input Ground 5-V power supply External inductor terminal External inductor terminal 5-V power supply Ground Local oscillator, negative input Local oscillator, positive input Ground 5-V power supply IF negative output
Absolute Maximum Ratings
All voltages are referred to GND.
Parameters Supply voltage LO input IF input Operating temperature Storage temperature Symbol VCC LOP, LON RFP, RFN TOP Tstg Value 5 to 5.5 10 15 -40 to +85 -65 to +150 Unit V dBm dBm C C
2
T0780
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T0780
Thermal Resistance
Parameters Junction ambient Junction case Symbol RthJA RthJC Value TBD 46 Unit K/W C/W
Electrical Characteristics
Test Conditions: VCC = +5 V, Tamb = +25C; RF input: -20 dBm at 900 MHz; LO output: 0 dBm at 700 MHz
No. 1 1.1 1.11 1.2 1.5 1.6 1.3 1.4 1.7 1.8 1.9 1.10 2 2.1 2.2 2.3 3 3.1 3.1 Parameters AC Performance RF frequency range LO frequency range IF frequency range Conversion gain SSB noise figure Input IP3 Input P1dB RF return loss LO return loss IF return loss LO drive Isolation Performance Leakage (LO-RF) Leakage (LO-IF) Leakage (RF-IF) Miscellaneous Supply voltage Supply current VCC ICC 4.75 5 160 5.25 180 V mA A A Single-ended configuration Single-ended configuration Single-ended configuration -40 -26 -40 -35 -20 -35 dBm dBm dBm D D D Matched to 50 W Matched to 50 W Matched to 50 W
(1) (1) (1)
Test Conditions / Pins
Pin
Symbo l fRF fLO FIF
Min. 800 500 30 7
Typ.
Max. 1000 1000
Unit MHz MHz MHz dB dB dBm dBm dB dB dB
Type * B, C B, C B, C A D D D D D D D
200 10 15
300 19
RF1 = RF2 = -15 dBm/tone, 1 MHz spacing
IP3
15 2
19 5 20 20 20
Matched to 50 W (1)
-3
0
+3
dBm
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. The return losses shown were measured with the T0780 mounted on Atmel's FR4 evaluation boards using standard matching practices as indicated on the application schematic page herein. Users following the RF, LO and IF matching guidelines will achieve similar performance.
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Typical Device Performance
Figure 3. Conversion Gain Versus Temperature
Conversion Gain vs Tem perature 20 Conversion Gain (dB) 16 12 8 4 0 800 -40C +25C +85C 850 900 Frequency (MHz) 950 1000
Figure 4. Conversion Gain Versus LO Drive, Tamb = 25C
Conversion Gain vs LO Drive T=+25C 20 Conversion Gain (dB) 16 12 8 4 0 800 Plo=-3dBm Plo=0dBm Plo=+3dBm 850 900 Frequency (MHz) 950 1000
Figure 5. Leakages, Plo = 0 dBm, Prf = -20 dBm, Single-ended Configuration (see Note 1)
Leakages Plo=0 dBm , Prf=-20 dBm Singled-Ended Configuration (Note 1) LO-RF LO-IF RF-IF
0 -10 Leakage (dBm) -20 -30 -40 -50
-60 800
850
900 950 Frequency (MHz)
1000
4
T0780
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T0780
Figure 6. Input IP3 Versus Temerature
Input IP3 vs Tem perature 30 Input IP3 (dBm) 25 20 15 10 800 -40C +25C +85C
850
900 Frequency (MHz)
950
1000
Figure 7. Input IP3 Versus LO Drive, Tamb = 25C
Input IP3 vs LO Drive T=+25C 30 Input IP3 (dBm) 25 20 15 10 800 Plo=-3dBm Plo=0dBm Plo=+3dBm
850
900 Frequency (MHz)
950
1000
Figure 8. Noise Figure Versus Temperature, Plo = 0 dBm
Noise Figure vs Tem perature Plo=0dBm 20 Noise Figure (dB) 18 16 14 12 10 800 -40C +25C +85C 850 900 Frequency (MHz) 950 1000
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Figure 9. RF & LO Return Loss (see Note 2), Tamb = 25C
RF & LO Return Loss (Note 2) T=+25C 0 Return Loss (dB) -5 -10 -15 -20 -25 -30 600 700 800 900 Frequency (MHz) 1000 RF RL LO RL
Figure 10. IF Return Loss (see Note 2), Tamb = 25C
IF Return Loss (Note 2) T=+25C 0 Reutrn Loss (dB) -5 -10 -15 -20 -25 -30 30 75 120 165 210 255 300 Frequency (MHz)
Figure 11. Input P1dB Versus Temperature, Plo = 0 dBm
Input P1dB vs Tem perature Plo=0dBm 10 -40C Input P1dB (dBm) 8 6 4 2 0 800 +25C +85C
850
900 Frequency (MHz)
950
1000
6
T0780
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T0780
Figure 12. Input P1dB Versus LO Drive, Tamb = 25C
Input P1dB vs LO Drive T=+25C 10 Input P1dB (dBm) 8 6 4 2 0 800 Plo=-3dBm Plo=0dBm Plo=+3dBm
850
900 Frequency (MHz)
950
1000
Figure 13. Demo Test Board Schematic
5V
IFout J5 Lfil
Vcc
C3 C4 RFin J3 L3 R2 C5
C7
Vcc
R1
Vcc
C20 L1
IC 1 1 2 3 4 5 6 7 8
T2 C9 16 15 14 13 12 11 10 9 L2 C1
Vcc
R3 L4 R4
C11 LOin J4
T0780
Vcc
C21
C12
Vcc
C6
Vcc
C10
7
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Bill of Material
Component Designator IC1 J3, J4, J5 T2 Lfil L1, L2 L3, L4 C1, C3, C20, C21 C6, C10 C7, C9 C4, C5 C11, C12 R1, R2, R3, R4 1:1 1 H see Table 1 180 nH 27 pF 100 pF 120 pF 10 pF 15 pF 0W Value Vendor Atmel Johnson Components Mini-circuits Wurth Elektronik TOKO TOKO Part Number T0780 142-0701-851 TC1-1 74476401 LL1608-FSR10J LL1608-FSR18J Description SiGe receiver mixer SMA connector, end launch with tab, for 0.062 inch board IF transformer Inductor, 1210 footprint, minimum 200 mA rating Inductor, 0603 footprint, high Q series Inductor, 0603 footprint, high Q series Capacitor, 0603 footprint Capacitor, 0603 footprint Capacitor, 0603 footprint Capacitor, 0603 footprint Capacitor, 0603 footprint Resistor, 0603 footprint
The T0780 utilizes an IF tank circuit to maximize performance across the entire IF bandwidth. the off-chip inductors L1 and L2 resonate with an on-chip capacitor (4 pF) to provide IF tunability. therefore, L1 and L2 must be selected such that the resonance occurs at the desired IF. The following table provides the inductor values required on the evaluation board for some common intermediate frequencies. By default, all evaluation board are shipped with L1 = L2 = 100 nH, resulting in a 200 MHz resonant IF. Table 1. IF Tank Circuit
IF (MHz) Typical 70 150 200 300 L1, L2 (nH) 680 150 100 39 TOKO Part Number LL2012-FHR68J LL1608-FSR15J LL1608-FSR10J LL1608-FS39NJ
The following procedure may be used to ensure that the proper inductor values have been selected for a given IF. 1. Prepare the evaluation board for a conversion gain measurement by using the "General Test Set-up". 2. Enable the "Max Hold" function on the spectrum analyzer and set the "SPAN" to 200 MHz. 3. Vary the LO frequency while maintaining a consonant input frequency. 4. The resonant will be observed at the peak of the response.
8
T0780
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Figure 14. Demo Test Board (Fully Assembled PCB)
J5
47 mm
T2 C7 C3 C9 IC1
T0780
C4 R1
C1 R3 R4 C21 L2 C10
C11 C12
J3
C5 R2 C20 L1 C6
J4
Lfil CON 2 1
47 mm
Figure 15. Recommended Package Footprint In order to avoid soldering problems, plugging of the ground vias under the heat slug is recommended!
31.75
6.35 0.74 0.4 3.0 0.74
3.0
f0.33 via
0.7
0.9
6.9
all units are in mm - Indicates metalization - vias connect pad to underlying ground plane Remark: heatslug must be soldered to GND.
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Ordering Information
Extended Type Number T0780-6C Package SSOP16 Remarks -
Package Information
10
T0780
4525B-SIGE-09/02
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4525B-SIGE-09/02 xM

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