A Temperature Compensated L-Band Hybrid SAW Oscillator and Resonator Filter
暂无分享，去创建一个
A 9 5 0 MHz s u b m l n l a t u r e t e m p e r a t u r e compensated SAW r e s o n a t o r osc I I I a t o r (TCSO) and a SAW r e s o n a t o r f l l t e r a r e d e v e l o p e d I n h y b r l d f o r m f o r a p p l l c a t l o n a s l o c a l o s c l I l a t o r and bandpass f I I t e r f o r a commun lca t l on system. The o s c l I l a t o r package vo lume Is a p p r o x l m a t e l y 0.02 c u b l c i n c h e s and t h e f l l t e r package Is a p p r o x l m a t e i y 0.01 c u b l c I n c h e s . The e x t r e m e l y t l g h t p a c k a g i n g r e q u i r e m e n t s a r e met by u t l l l z l n g c h i p r e s i s t o r s and c a p a c i t o r s , p r l n t e d s p l r a l I n d u c t o r s , and c h i p t r a n s i s t o r s and d l o d e s . The SAW o s c l l l a t o r c o n s i s t s o f a t e m p e r a t u r e s e n s i n g ne twork , a v a r a c t o r d l o d e t u n i n g c l r c u l t , and a s l n g l e p o r t SAW r e s o n a t o r osc 1 I I a t o r . The SAW r e s o n a t o r bandpass f l l t e r c o n s l s t s o f a f o u r e l e m e n t i n p u t m a t c h l n g ne twork , a t w o p o r t t w o p o l e SAW r e s o n a t o r , and f o u r e l e m e n t o u t p u t m a t c h l n g n e t w o r k I n h y b r l d fo rm. T h l s paper d e s c r i b e s t h e d e s i g n , f a b r l c a t l o n and p e r f o r m a n c e o f a SAW r e s o n a t o r c o n t r o l l e d o s c l I l a t o r and a SAW r e s o n a t o r f l l t e r . These c i r c u i t s u t l l l z e h y b r l d t e c h n l q u e s t o a c h i e v e e x t r e m e l y s m a l l s i z e . Tempera tu re compensa t lon I s 1 nc I uded i n t h e osc I I I a t o r t u n I ng n e t w o r k I n o r d e r t o m i n i m i z e f r e q u e n c y s h i f t s . The o s c i l l a t o r p e r f o r m a n c e g o a l s a r e low phase n o i s e ( 5 0 dBc/Hz a t 10 H z ) , modera te RF o u t p u t power (0 dBm), m l n l m a l D C power d r a i n , and good f r e q u e n c y s t a b l l i t y o v e r t h e o p e r a t l n g t e m p e r a t u r e r a n g e o f OOC t o + 5 O o C . The goa l f o r s e t on f r e q u e n c y a c c u r a c y and f r e q u e n c y d r i f t due t o t e m p e r a t u r e I s 2 1 5 ppm. The r e s o n a t o r f l l t e r was d e s l g n e d and mode led u s l n g a t r a n s m l s s l o n m a t r i x approach. Low i n s e r t i o n loss ( 5 d B ) and mlnlmum r i p p l e I n t h e pass band were a c h i e v e d by I n c l u d l n g a m a t c h l n g n e t w o r k I n s i d e t h e m i n i a t u r e package and u s l n g an o v e r l a p a p o d l z a t l o n scheme on t h e t r a n s d u c e r s . QSClLLAIQB Q€3lEl A s i n g l e p o r t SAW r e s o n a t o r was used I n a P l e r c e t y p e h y b r i d o s c l l l a t o r c l r c u i t u t l l l z i n g c h i p t r a n s i s t o r s , d lodes , r e s l s t o r s and c a p a c l t o r s , and a p r l n t e d s p l r a l I n d u c t o r . The c l r c u r t d l a g r a m o f t h e v o l t a g e t u n e d o s c i l l a t o r Is shown In F l g u r e 1 .The P i e r c e osc I I I a t o r c o n f l g u r a t l o n has been shown t o r e q u l r e fewer t u n l n g e l e m e n t s and p r o v i d e b e t t e r s t a b i I i t y t h a n o t h e r c o n f 1 g u r a t i o n s . l The t r a n s l s t o r chosen was a b i p o l a r d e v l c e (HXTR 2001) w l t h 18 dB g a i n and 2 dB n o l s e f l g u r e a t 1 0 0 0 MHz. A b l p o l a r t r a n s l s t o r t y p l c a l l y e x h i b i t s 1 0 t o 15 dB l o w e r phase n o f s e t h a n a comparab le f l e l d e f f e c t t r a n s l s t o r when used I n an o s c l l l a t o r o f t h l s t y p e . 2 A r e s o n a t o r was chosen o v e r a d e l a y I I n e as t h e f r e q u e n c y c o n t r o l l l n g feedback e l e m e n t because o f t h e low phase n o i s e r e q u i r e m e n t . The s i n g l e p o r t SAW r e s o n a t o r s w i n g s I n d u c t i v e a t t h e r e s o n a n t f r e q u e n c y and i s s e r l e s r e s o n a n t w l t h t h e base c a p a c i t o r , cb. A v a r a c t o r d l o d e was i n c l u d e d i n s e r l e s w l t h c a p a c l t o r c b i n o r d e r t o v a r y t h e f r e q u e n c y o f o s c l l l a t l o n . The v a r a c t o r d l o d e chosen was an M S I E l e c t r o n i c s M V 1 4 1 2 . T h l s d l o d e has a nomina l v a l u e o f 1 0 p f , a t u n l n g r a t l o o f 7 . 5 : 1 , and a Q o f 2 0 0 a t 1 MHz. T y p i c a l f r e q u e n c y put I I n g o f t h e o s c l l l a t o r was 4 0 PPM w i t h a t u n l n g v o l t a g e o f 0 t o +6 v o l t s . The RF o u t p u t power was e x t r a c t e d v l a a t a p p e d I n d u c t o r I n an LC t a n k c l r c u i t on t h e c o l l e c t o r o f t h e t r a n s l s t o r . T h l s app roach y l e l d s good o u t p u t power and low ha rmon lc c o n t e n t . SAW 1-PORT RESONATOR VOLTAGE CONTROLLED OSCILLATOR PIERCE COHFIGURATION
[1] L. Coldren,et al. Scattering Analysis and Design of SAW Resonator Filters , 1979, IEEE Transactions on Sonics and Ultrasonics.
[2] N. Howard. GHz Thick Film Hybrid SAW Oscillators , 1983 .
[3] R. Rosenfeld,et al. SAW Resonator Filters with Optimized Transducer Rejection , 1981 .
[4] R. Kinsman. Temperature Compensation of Crystals with Parabolic Temperature Coefficients , 1978 .
[5] R. Kindell,et al. Precision L-Band SAW Oscillator for Satellite Application , 1983 .
[6] G.L. Matthaei,et al. Synthesis of Acoustic-Surface-Wave-Resonator Filters Using any of Various Coupling Mechanisms , 1977, 1977 IEEE MTT-S International Microwave Symposium Digest.