Sampling Phase Detectors SPD Series Features 3 Low Cost Design Rugged, Modular, Hybrid Construction Phase Locks VCO and DROs up to 20 GHz Wide Frequency Range Available for Oscillator Signal Levels from -3 dBm to +13 dBm Hermetic Package Available Description Alpha's series of Sampling Phase Detectors (SPD's) consist of a hybrid assembly of an SRD comb generator, coupling capacitors and microwave mixer diodes. This module makes an inexpensive way of phase locking a commercial VCO source to a low frequency stable reference. Each part in the series is optimized to operate in standard narrow band commercial systems. All units handle reference frequencies in the 50 to 500 MHz band. Component selection within Alpha allows us to minimize beat note output. It is easiest to think of the SPD in its two constituent forms; a comb generator and subharmonic mixer. The comb generator portion consists of the external reference, amplifier and impedance transformer. The external circuit matches into the low impedance of the SRD portion of the SPD. Careful attention to matching by setting the right transformer ratio, detuning the circuit with shunt capacitors will result in larger amplitude beat note signals. The subharmonic mixer portion is the Schottky series pair. Various drive levels can be used to tailor intermodulation and beat note performance. The basic operation of a SPD is when the reference signal is fed into the SRD. This sets up a strong pulse, rich in harmonics that is used to strobe the mixer diodes on. The balanced mixer design converts the sampled oscillator signal and matching harmonics into an IF beat note. This signal can then be used in feedback loop to correct tuning voltage on the VCO. Typical applications include phase locking of oscillators in TVRO, VSAT, DBS and telecommunications markets. Leadless chip carriers and surface mount versions are also available Alpha Industries * * Fax * E-mail * Visit our web site: 3-39 Sampling Phase Detectors SPD Series Electrical Specifications at 25C Microwave Signal Level dBm Operating Frequency GHz VF @ 1 mA mV RS CJ @ 0V pf Beam Lead Coupling Capacitors CL pf Typ. Max. Typ. Typ. Typ. Typ. Typ. Typ. Typ. Min. 4 240 3 0.40 1.0 0.35 25 50 14 -3 to 0 12 275 6 0.25 0.6 0.35 25 50 14 SPD2827-211 18 300 10 0.12 0.5 0.35 25 50 14 SPD2828-211 20 325 15 0.08 0.5 0.35 25 50 14 SPD2050-211 4 350 3 0.40 1.0 0.35 25 50 14 SPD2829-211 12 375 6 0.25 0.6 0.35 25 50 14 SPD2830-211 18 400 10 0.12 0.5 0.35 25 50 14 SPD2831-211 20 450 15 0.08 0.5 0.35 25 50 14 SPD2092-211 4 550 3 0.40 1.0 0.35 25 50 14 Monolithic Schottky Diode Pair Part Number SPD2835-211 SPD2826-211 0 to +3 SPD2093-211 Beam Lead Step Recovery Diode CJ @ 6V pf TL nS TT pS VB V 12 575 6 0.25 0.6 0.35 25 50 14 SPD2832-211 18 625 10 0.12 0.5 0.35 25 50 14 SPD2833-211 20 675 15 0.08 0.5 0.35 25 50 14 0 to +13 Any of the above can be made in hermetic packages. The part number series is SPDXXXX-217. Typical Performance Data SPD 3465-18 Low Drive Suggested Circuit Configuration Beat Note ( f ) Output Voltage (mV) 1000 10K 800 Reference Frequency Input 10-500 MHz 600 100 47 pF 22 pF CL RFC SRD 400 CL Input Transformation Ref. Frequency: 100 MHz Ref. Input Power: +17 dBm DRO/VCOI Power: 0 dBm 200 2 4 6 8 10 12 100 IF Output 39 pF 100 47 pF 1. 0 Microwave Input 14 16 18 20 10K Input transformer 10:1 turns ratio low impedance at SRD; MCL617 or equivalent. VCO/DRO (Microwave) Frequency (GHz) 3-40 Alpha Industries * * Fax * E-mail * Visit our web site: Sampling Phase Detectors 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 300 Beat Note Output (mV ppk) Output Voltage (mV ppk) SPD Series 275 250 225 200 175 150 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 15 16 Degrees C 17 18 19 20 21 22 23 24 Power (dBm) of Reference Beat Note Voltage vs Temperature (Frequency 100 MHz, Ref Power +10 dBm) Beat Note Voltage vs Power (100 MHz Reference) Outline Drawing 211 (Epoxy) 217 (Hermetic) 0.103 (2.62 mm) 0.097 (2.46 mm) 0.028 (0.58 mm) 0.017 (0.43 mm) (4 PLCS.) SCHEMATIC 2 3 SCHEMATIC 2 3 4 4 2 3 0.050 (1.27 mm) 4 0.078 (1.98) 0.072 (1.83) 1 5 0.022 (0.56 mm) 0.018 (0.46 mm) (5 PLCS.) 1 0.220 (5.59mm) 0.210 (5.33mm) .063 (1.60mm) TYP 3 NC NC 0.062 (1.57 mm) (4 PLCS.) 5 0.012 (0.30 mm) (2 PLCS. MIN.) EPOXY ENCAPSULATION 0.035 (0.89 mm) MAX. 0.012 (0.30 mm) 0.008 (0.20 mm) 0.005 (0.13 mm) 0.003 (0.08 mm) (5 PLCS.) METAL PARTS GOLD PLATED 0.065 (1.65mm) MAX 0.130 (3.30mm) 0.007 (0.18mm) 0.003 (0.08mm) TYP 7 PLCS 0.130 (3.30 mm) TYP 0.268 (6.81mm) 0.252 (6.40mm) 4 2 1 5 1 0.045 (1.14mm) TYP 0.160 (4.06mm) 0.120 (3.05 mm) 7 PLCS 5 0.013 (0.33mm) 0.007 (0.18mm) 7 PLCS 0.031 (0.79mm) MAX 7 PLCS Alpha Industries * * Fax * E-mail * Visit our web site: 3-41