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SolidStqte

Micro SSM

Technology

for Music 2013

VOTTAGE CONTROLLED AM PLI FI ER*

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T h e S S M 2 0 1 3 i s a l o w c o s t , h i g h p e r f o r m a n c e a n t i l o g v o l t a g e c o n t r o l l e d a m p l i f i e r w i t h fu l l c l a s s A p e r f o r m a n c e . T h e d e v i c e h a s a 9 4 d B s i g n a l t o n o i s e f i g u r e a t 0 . 0 1 % T H D . T h e c u r r e n t i n p u t s a n d o u t p u t s m a k e p o s s i b l e w i d e b a n d w i d t h , e a s y s i g n a l s u m m i n g , a n d m i n i m u m e x t e r n a l c o m p o n e n t c o u n t . I n h e r e n t l y l o w c o n t r o l f e e d t h r o u g h a n d 2 n d h a r m o n i c d i s t o r t i o n m a k e tr i m m i n g u n n e c e s s a r y f o r m o s t a p p l i c a t i o n s . ' I n a d d i t r o n . t h e 2 0 1 3 h a s m o r e th a n 1 2 d B o f h e a d r o o m a t t h e r a t e d s p e c i f i c a t i o n s a n d c a n b e c o n f i g u r e d t o g i v e u p to 4 0 d B o f g a i n .

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T h e c i r c u i t a b o v e s h o w s t h e ty p r c a l c o n n e c t i o n o f t h e 2 0 1 3 a s a orecrsion v r ) i ' r a ( t e c o n t r o l l e d a m p l i f i e r . W h e n th e v o l t a g e o n p i n 9 i s g r o u n d , t h e device w i l l b e o p e r a t i n g a t u n r t y c u r r e n t g a i n

S i g n a l I n p u t ( P i n 1 3 )

S i n c e th e 2 0 1 3 is a c u r r e n t i n p u t , c u r r e n t o u t p u t d e v i c e . t h e in p u t a n d o u t p u t re s i s t o r v a l u e s c a n b e s e l e c t e d t o g i v e o p t i m u m p e r f o r m a n c e f o r a n y g i v e n s i g n a l p r o c e s s i n g e n v i r o n m e n t A p e a k to p e a k in p u t s i g n a l o f , 3 0 0 p A w i l l g i v e the r a t e d s p e c i f i c a t i o n s a n d a l l o w f o r 1 2 d B o f h e a d r o o m . T h e d e v i c e c a n h a n d l e m o r e t h a n , 1 2 m A w i t h o u t c l i p p i n g o r o t h e r r a d i c a l i n c r e a s e s i n d i s t o r t i o n . l f t l r e a v e r a g e p e a k input s i g n a l i s 7 V p e a k to p e a k a n d lh e supplies a r e , 1 5 V , a 1 2 K r n p u t r e s i s t o r w i l l y i e l d t h e p r o p e r i n p u t c u r r e n t a n d h e a d r o c - r m .

F r e q u e n t l y 1 6 to 2 4 d B o f h e a d r o o m i s r e q u i r e c l t o h a n d l e h i g h c r e s t { a c t o r m a t e r i a l s u c h a s p e r c u s s i v e i n s t r u m e n t s . A r 1 2 0 p A , , , , i n p u t s i g n a l l e v e l w i l l a l l o w l o r 2 0 d B o f h e a d r o o m a n d y r e l d i r r i B 6 c j R s i q n a l t o n o i s e r a t i o a t u n i t y g a r n . T h e T H D a n d IM D c h a r a c t e r i s t i c s , g i v e n i n th e g r a p h a t th e b o t t o m r r g h t o f p a g e 2 , w i l l ir n p r o v e ( d e c r e a s e ) b y a f a c t o r o f 2 . 5 .

T h e in p u t D . C . b l o c k i n g c a p a c i t o r i s r e q u i r e d f o r best performance s o t h a t o f f s e t s i n p r e v i o u s s t a g e s o o n o t u p s e t t h e b a l a n c e o f t h e d e v i c e C , , , s h o u l d b e c h o s e n s o t h a t t h e R , C,,, c o m b i n a t i o n g i v e s a c u t o f f f r e q u e n c y b e i o w t h e audio b a n d .

S i g n a l O u t p u t ( P i n a )

S i n c e th e 2 0 1 3 is c a p a b l e o f c u r r e n t g a i n as well as attenuation, s e v e r a l c o n s i d e r a t i o n s g o into the selection o f t h e f e e d b a c k r e s i s t o r i n th e o u t p u t c u r r e n t t o v o l t a g e c o n v e r t o r . D i s t o r t i o n w i l l in c r e a s e s i g n i f i c a n t l y w h e n t h e d e v i c e i s o p e r a t e d a b o v e 2 0 t o 3 0 d B o f c u r r e n t g a i n . ( S e e g r a p h a t b o t t o m l e f t . ) G a i n o b t a i n e o r n th e output o p a m p b y r a t i o i n g t h e o u t p u t t o i n p u t r e s i s t o r s i s a t t h e e x p e n s e o f r a i s i n g t h e n o i s e f l o o r b y t h e g a i n fa c t o r . l f a maximum o f 4 0 d B o f g a r n is d e s i r e d t h e n o i s e f l o o r w o u l d b e r a i s e d f r o m around 94dB 1o 54dB referred t o a u s a b l e i n p u t s i g n a l l e v e l .

A w o r k a b l e c o m p r o m i s e i n th r s c a s e w o u l d b e t o a l l o w f o r 2 0 t o 3 0 d B of current g a i n rn the 2013 a n d g e t th e r e s t f r o m t h e o p a m p . T h i s w i l l r e s u l t i n a s e v e r a l d B i m p r o v e m e n t i n t h e n o r s e f l o o r a t m a x i m u m g a i n and a significant r e d u c t i o n i n d i s t o r t i o n .

Noise Measurement

A u d i o n o i s e in t h e 2 0 1 3 c a n n o t b e c o r r e c t l y c a l c u l a t e d f r o m a b r o a d b a n d n o i s e m e a s u r e m e n t . T h i s r s b e c a u s e t h e 5 0 0 0 p F - 4 7 O n e t w o r k a t th e in p u t f o r m a z e r o in th e c o m p e n s a t i o n n e t w o r k a t 6 0 0 k H z . T h e n o i s e f lo o r w i l l ro l l u p a t th e r a t e o f + 6 d B p e r o c t a v e f r o m a b o u t 4 5 k H z t o 6 0 0 k H z w h e r e it w i l l a g a i n r o l l o f f . W h e n m e a s u r i n g a u d i o n o i s e i n th e 2 0 1 3 o n e s h o u l d l i m i t t h e b a n d w i d t h l o 2 O k H z o r 3 0 k H z .

T h e c a p a c i t o r i n t h e o u t p u t c u r r e n t t o v o l t a g e c o n v e r t o r i s n e e d e d t o i n s u r e s t a b i l i t y u n d e r a l l s i g n a l a n d o u t p u t l o a d c o n d i t i o n s . A c o r n e r f r e q u e n c y o f 3 0 0 k H z w i l l a c c o m p l i s h t h i s b u t a l o w e r f r e q u e n c y m a y b e d e s i r e d t o l i m i t n o i s e o u t s i d e t h e a u d i o b a n d a t th e e x o e n s e o f a s l o w e r t r a n s i e n t r e s o o n s e .

l l 0 8 : )

(4)

M u t e C o n t r o l ( P i n 1 0 )

T h e m u t e c i r c u i t i n t h e 2 0 1 3 a l l o w s o n e to o v e r r i d e t h e d B v o l u m e c o n t r o l o n p i n 9 a n d to t u r n th e d e v i c e o f f o r o n a t a c o n t r o l l e d r a t e . T h e m u t e c o n t r o l w i l l r e s p o n d c o r r e c t l y t o t h e o u t p u t o f m o s t lo g i c f a m i l i e s o p e r a t i n g f r o m + 5 V t o + 1 5 V s u p p l i e s i n c l u d i n g T T L a n d C M O S . T h e m u t e c a p o n p i n 1 2 d e t e r m i n e s t h e tu r n o n / t u r n o f f r a t e . T h i s c a p a n d a n i n t e r n a l 1 0 K im p e d a n c e g i v e s a t i m e c o n s t a n t o f 1 O m S w i t h th e l p f c a p s h o w n . W i t h th i s v a l u e a t r a n s i t i o n w i l l b e p e r c e i v e d a s q u i c k w i t h o u t b e i n g t o o a b r u p t o r " p o p p y . " T h e im p e d a n c e a t th e m u t e i n p u t i s n e a r l y i n f i n i t e b e l o w + 2 V a n d lo w e r s t o a b o u t l O K a b o v e + 3 V .

d B / V C o n t r o l ( P i n 9 )

T h e c o n t r o l p i n on the 2013 i s a h i g h im p e d a n c e i n p u t w i t h a n o v e r a l l c o n t r o l r a n g e o f + 4 0 d B to l e s s th a n 9 5 d 8 . T h e c o n t r o l s e n s i t i v i t y i s 1 d B / 1 O m V t o w i t h i n r 1 .5 d B o v e r a t 3 6 d B ra n g e . T h e R , , R , a t t e n u a t o r t o p t n 9 a l l o w s t h e u s e r to t a i l o r t h e g a i n s e n s i t i v i t y o f t h e d e v i c e t o t h e a v a i l a b l e c o n t r o l v o l t a g e r a n g e . ( T h e control s e n s i t i v i t y i s ' l O m V / d B

a t p i n 9 . N e g a t i v e v o l t a g e s g i v e c u r r e n t g a i n and positrve v o l t a g e s g i v e attenuation.) l f m o r e g a i n a c c u r a c y i s r e q u i r e d o v e r a w i d e r r a n g e a n d / o r i f a c o n t r o l s u m m e r i s r e q u i r e d , t h e c i r c u i t i n F i g u r e . l b e l o w i s r e c o m m e n d e d .

T r i m m i n g ( P i n s 2 , 3 , 6 , 1 3 )

T h e 2 0 1 3 h a s b e e n d e s i g n e d f o r m i n i m u m d i s t o r t i o n , o f f s e t a n d c o n t r o l f e e d t h r o u g h a t u n i t y c u r r e n t g a i n . I n o r d e r t o g e t o p t i m u m p e r f o r m a n c e i n a p p l i c a t i o n s r e q u i r r n g m o r e t h a n 1 0 t o 2 0 d B o f g a i n , a t r i m p o i n t h a s b e e n p r o v i d e d . S i n c e d i s t o r t i o n r n th e 2 0 1 3 i s m o r e v a r i a b l e f r o m d e v i c e t o d e v i c e a t h i g h c u r r e n t g a i n , t h e tr i m a l l o w s o n e to g e t th e b e s t o v e r a l l d i s t o r t i o n f i g u r e s v s . g a i n o n a r e p e a t a b l e b a s i s . T h e p r o c e d u r e i s t o a p p l y a c o n t r o l v o l t a g e t o p i n 9 c o r r e s p o n d i n g t o t h e m a x i m u m d e s i r e d c u r r e n t g a i n a n d s e t th e in p u t l e v e l s o th a t t h e o u t p u t i s ju s t b e l o w c l i p p i n g . T h e tr i m is th e n a d j u s t e d t o g i v e m i n i m u m d i s t o r t r o n .

C o n t r o l f e e d t h r o u g h i n th e 2 0 1 3 c a r i b e r e d u c e d b y u s r n g t h e o p t i o n a l a d j u s t m e n t s h o w n i n F i g u r e 2 A . T h e p r o c e d u r e i s t o a p p l y a n A . C . c o n t r o l v o l t a g e s i g n a l w h i c h s w e e p s f r o m th e m i n i m u m t o m a x i m u m d e s i r e d g a i n . The srgnal f e e d i n g t h r o u g h t o t h e o u t p u t i s t h e n tr i m m e d t o a m i n i r n u m . T h e f i x e d n e t w o r k i n F i g u r e 2 B c a n a l s o b e u s e to r e d u c e c o n t r o l f e e d t h r o u o h .

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